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32 results on '"Nanofab (Nanofab )"'

1. Neuron-gated silicon nanowire field effect transistors to follow single spike propagation within neuronal network

Author: Mireille Albrieux, Anne Briancon Marjollet, Cécile Delacour, Guillaume Bres, Julien Minet, Farida Veliev, Catherine Villard, Thierry Crozes, Thomas Ernst, I. Ionica, Guillaume Becq, Institut Néel (NEEL), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA)-Université Grenoble Alpes (UGA)-Centre National de la Recherche Scientifique (CNRS), Nanofab (Nanofab), Université Grenoble Alpes (UGA)-Université Grenoble Alpes (UGA)-Centre National de la Recherche Scientifique (CNRS)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Electronique (ElecLab), Université de Liège, Institut de Microélectronique, Electromagnétisme et Photonique - Laboratoire d'Hyperfréquences et Caractérisation (IMEP-LAHC ), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), Commissariat à l'énergie atomique et aux énergies alternatives - Laboratoire d'Electronique et de Technologie de l'Information (CEA-LETI), Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), CHU Sud Saint Pierre [Ile de la Réunion], Cytosquelette et Intégration des Signaux du Micro-Environnement Tumoral - UMR 6032 (CISMET), Centre National de la Recherche Scientifique (CNRS)-Université de Provence - Aix-Marseille 1-Université de la Méditerranée - Aix-Marseille 2, Thermodynamique et biophysique des petits systèmes (TPS), Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA), Institut de Microélectronique, Electromagnétisme et Photonique - Laboratoire d'Hyperfréquences et Caractérisation (IMEP-LAHC), Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), HP2, Pole Biol CHU Grenoble (INSERM, U1042), Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), Inserm, U1216, Grenoble, France., Institut National de la Santé et de la Recherche Médicale (INSERM), Thermodynamique et biophysique des petits systèmes (NEEL - TPS), Nanofabrication (NEEL - Nanofab), Electronique (NEEL - ElecLab), and ANR-18-CE42-0003,NanoMesh,Nanoelectronique graphene pour des interfaces neuronales multifonctionnelles(2018)
Subjects: Materials science, Silicon, Microfluidics, Nanowire, chemistry.chemical_element, 02 engineering and technology, Local field potential, 01 natural sciences, law.invention, 03 medical and health sciences, law, Nano, 0103 physical sciences, Biological neural network, Premovement neuronal activity, General Materials Science, [SPI.NANO]Engineering Sciences [physics]/Micro and nanotechnologies/Microelectronics, 030304 developmental biology, 010302 applied physics, 0303 health sciences, business.industry, Transistor, 021001 nanoscience & nanotechnology, Condensed Matter Physics, chemistry, Optoelectronics, Field-effect transistor, Spike (software development), 0210 nano-technology, business, Sensitivity (electronics)
Abstract: Silicon nanowire field effect transistors SiNW-FETs provide a local probe for sensing neuronal activity at the subcellular scale, thanks to their nanometer size and ultrahigh sensitivity. The combination with micro-patterning or microfluidic techniques to build model neurons networks above SiNW arrays could allow monitoring spike propagation and tailor specific stimulations, being useful to investigate network communications at multiple scales, such as plasticity or computing processes. This versatile device could be useful in many research areas, including diagnosis, prosthesis, and health security. Using top-down silicon nanowires-based array, we show here the ability to record electrical signals from matured neurons with top-down silicon nanowires, such as local field potential and unitary spike within ex-vivo preparations and hippocampal neurons grown on chip respectively. Furthermore, we demonstrate the ability to guide neurites above the sensors array during 3 weeks of cultures and follow propagation of spikes along cells. Silicon nanowire field effect transistors are obtained by top-down approach with CMOS compatible technology, showing the possibility to implement them at manufacturing level. These results confirm further the potentiality of the approach to follow spike propagation over large distances and at precise location along neuronal cells, by providing a multiscale addressing at the nano and mesoscales.
Published: 2020
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2. Tuning Electroluminescence from a Plasmonic Cavity-Coupled Silicon Light Source

Author: M. den Hertog, James F. Cahoon, Sebastian Glassner, B. Fernandez, Hamid Keshmiri, Alois Lugstein, David Hill, Vienna University of Technology (TU Wien), Vienna Biocenter - VBC [Austria], Technische Hoschschule, University of Applied Sciences [Darmstadt], Department of Chemistry, North Carolina State University, Raleigh, NC 27695, affiliation inconnue, Nanofab (Nanofab ), Institut Néel (NEEL), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), and Matériaux, Rayonnements, Structure (MRS)
Subjects: Materials science, Silicon, Band gap, chemistry.chemical_element, Bioengineering, 02 engineering and technology, Integrated circuit, Electroluminescence, 01 natural sciences, 7. Clean energy, law.invention, Footprint (electronics), law, 0103 physical sciences, Hardware_INTEGRATEDCIRCUITS, General Materials Science, Scaling, ComputingMilieux_MISCELLANEOUS, Plasmon, 010302 applied physics, Silicon photonics, Mechanical Engineering, General Chemistry, 021001 nanoscience & nanotechnology, Condensed Matter Physics, Engineering physics, chemistry, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], 0210 nano-technology
Abstract: The combination of Moore's law and Dennard's scaling rules have constituted the fundamental guidelines for the silicon-based semiconductor industry for decades. Furthermore, the enormous growth of global data volume has pushed the demand for complex and densely packed devices. In recent years, it has become clear that wired interconnects impose increasingly severe speed and power limitations onto integrated circuits as scaling slows toward a halt. To overcome these limitations, there is a clear need for optical data processing. Despite significant progress in the development of silicon photonics, light sources remain challenging owing to the indirect bandgap of group IV materials. It is therefore highly desirable to develop new concepts for a silicon light source that meets efficiency and footprint requirements similar to their electronic counterparts. Here, we demonstrate an electrically driven and tunable silicon light source by matching the resonant modes of a silver nanocavity with the hot luminescence spectrum of an avalanching p-n junction. The cavity significantly enhances phonon-assisted recombination of hot carriers by tailoring the local density of states at the size-tunable resonance. Such tunable nanoscale emitter may be of great interest for short-reach communications, microdisplays or lab-on-chip applications.
Published: 2018
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3. On-chip Thermometry for Microwave Optomechanics Implemented in a Nuclear Demagnetization Cryostat

Author: R. R. Gazizulin, Olivier Maillet, Thierry Crozes, Eddy Collin, A. Luck, Andrew Fefferman, Olivier Bourgeois, J.-F. Motte, D. Cattiaux, Xin Zhou, Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 (IEMN), Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF), Nano and Microsystems - IEMN (NAM6 - IEMN), Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF), Ultra-basses températures (UBT), Institut Néel (NEEL), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), Nanofab (Nanofab ), Thermodynamique et biophysique des petits systèmes (TPS), Ultra-basses températures (NEEL - UBT), Nanofabrication (NEEL - Nanofab), Thermodynamique et biophysique des petits systèmes (NEEL - TPS), A C K N O W L E D G M E N T S :We acknowledge the use of the Néel facility Nanofab for the device fabrication, and the Néel Cryogenics facility with especially Anne Gerardin for realization of mechanical elements of the demagnetization cryostat. X.Z. and E.C. thank Olivier Arcizet and Benjamin Pigeau for help in room-temperature characterization of the NEMS devices using optics, E.C. also thanks O. Arcizet, M. Sillanpää,K. Lehnert, J. Teufel, S. Barzanjeh, K. Schwab, J. Parpia, and M. Dykman for very useful discussions. We acknowledge support from the ERC CoG Grant ULT-NEMS No. 647917, StG Grant UNIGLASS No. 714692, and theSTaRS-MOC project from Région Hauts-de-France. The research leading to these results has received funding fromthe European Union’s Horizon 2020 Research and Innovation Programme, under Grant Agreement No. 824109, theEuropean Microkelvin Platform (EMP). Note added.—Recently, a collaboration between Aalto University and Institut Néel has started with the aim of cooling down a drumhead Al device as low as possible on our adiabatic nuclear demagnetization platform. We have evidence that the same features as for beams are present, at a different level of expression. This shall be publishedelsewhere., European Project: 647917,H2020,ERC-2014-CoG,ULT-NEMS(2015), European Project: 714692,H2020,ERC-2016-STG,UNIGLASS(2017), and European Project: 824109,H2020,H2020-INFRAIA-2018-1,EMP(2019)
Subjects: Cryostat, Quantum decoherence, Materials science, Nuclear engineering, FOS: Physical sciences, General Physics and Astronomy, 02 engineering and technology, Mechanics, 7. Clean energy, 01 natural sciences, Mesoscale and Nanoscale Physics (cond-mat.mes-hall), 0103 physical sciences, Thermal, 010306 general physics, Adiabatic process, Optomechanics, [PHYS.COND.CM-MSQHE]Physics [physics]/Condensed Matter [cond-mat]/Mesoscopic Systems and Quantum Hall Effect [cond-mat.mes-hall], Quantum Physics, Condensed Matter - Mesoscale and Nanoscale Physics, 021001 nanoscience & nanotechnology, Condensed Matter Physics, 3. Good health, Active cooling, 0210 nano-technology, Ground state, Microwave
Abstract: We report on microwave optomechanics measurements performed on a nuclear adiabatic demagnetization cryostat, whose temperature is determined by accurate thermometry from below 500$~\mu$K to about 1$~$Kelvin. We describe a method for accessing the on-chip temperature, building on the blue-detuned parametric instability and a standard microwave setup. The capabilities and sensitivity of both the experimental arrangement and the developed technique are demonstrated with a very weakly coupled silicon-nitride doubly-clamped beam mode of about 4$~$MHz and a niobium on-chip cavity resonating around 6$~$GHz. We report on an unstable intrinsic driving force in the coupled microwave-mechanical system acting on the mechanics that appears below typically 100$~$mK. The origin of this phenomenon remains unknown, and deserves theoretical input. It prevents us from performing reliable experiments below typically 10-30$~$mK; however no evidence of thermal decoupling is observed, and we propose that the same features should be present in all devices sharing the microwave technology, at different levels of strengths. We further demonstrate empirically how most of the unstable feature can be annihilated, and speculate how the mechanism could be linked to atomic-scale two level systems. The described microwave/microkelvin facility is part of the EMP platform, and shall be used for further experiments within and below the millikelvin range., Comment: 14 pages with appendix; plus Erratum 17, 049901 (2022)
Published: 2019
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4. Monolithic Axial and Radial Metal–Semiconductor Nanowire Heterostructures

Author: Bruno Fernandez, Masiar Sistani, Jun Yao, M. Den Hertog, Minh Anh Luong, Eric Robin, Alois Lugstein, Maria Spies, Emmerich Bertagnolli, Institute of Applied Physics [Vienna] (TU Wien), Vienna University of Technology (TU Wien), Laboratoire d'Etude des Matériaux par Microscopie Avancée (LEMMA ), Modélisation et Exploration des Matériaux (MEM), Institut de Recherche Interdisciplinaire de Grenoble (IRIG), Direction de Recherche Fondamentale (CEA) (DRF (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])-Institut de Recherche Interdisciplinaire de Grenoble (IRIG), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), Matériaux, Rayonnements, Structure (MRS), Institut Néel (NEEL), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), Nanofab (Nanofab ), Department of Electrical and Computer Engineering - University of Massachusetts (ECE), University of Massachusetts [Amherst] (UMass Amherst), University of Massachusetts System (UMASS)-University of Massachusetts System (UMASS), Université Grenoble Alpes [2016-2019] (UGA [2016-2019])-Institut de Recherche Interdisciplinaire de Grenoble (IRIG), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Matériaux, Rayonnements, Structure (NEEL - MRS), and Nanofabrication (NEEL - Nanofab)
Subjects: Materials science, Fabrication, Nanostructure, Nanowire, Physics::Optics, chemistry.chemical_element, Bioengineering, Germanium, 02 engineering and technology, 01 natural sciences, Monocrystalline silicon, Condensed Matter::Materials Science, 0103 physical sciences, General Materials Science, 010306 general physics, Lithography, Plasmon, ComputingMilieux_MISCELLANEOUS, business.industry, Mechanical Engineering, Heterojunction, General Chemistry, Condensed Matter::Mesoscopic Systems and Quantum Hall Effect, 021001 nanoscience & nanotechnology, Condensed Matter Physics, chemistry, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], Optoelectronics, 0210 nano-technology, business
Abstract: The electrical and optical properties of low-dimensional nanostructures depend critically on size and geometry and may differ distinctly from those of their bulk counterparts. In particular, ultrathin semiconducting layers as well as nanowires have already proven the feasibility to realize and study quantum size effects enabling novel ultrascaled devices. Further, plasmonic metal nanostructures attracted recently a lot of attention because of appealing near-field-mediated enhancement effects. Thus, combining metal and semiconducting constituents in quasi one-dimensional heterostructures will pave the way for ultrascaled systems and high-performance devices with exceptional electrical, optical, and plasmonic functionality. This Letter reports on the sophisticated fabrication and structural properties of axial and radial Al-Ge and Al-Si nanowire heterostructures, synthesized by a thermally induced exchange reaction of single-crystalline Ge-Si core-shell nanowires and Al pads. This enables a self-aligned metallic contact formation to Ge segments beyond lithographic limitations as well as ultrathin semiconducting layers wrapped around monocrystalline Al core nanowires. High-resolution transmission electron microscopy, energy dispersive X-ray spectroscopy, and μ-Raman measurements proved the composition and perfect crystallinity of these metal-semiconductor nanowire heterostructures. This exemplary selective replacement of Ge by Al represents a general approach for the elaboration of radial and axial metal-semiconductor heterostructures in various Ge-semiconductor heterostructures.
Published: 2018
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5. A Direct Sensor to Measure Minute Liquid Flow Rates

Author: Benjamin Cross, Preeti Sharma, Cyril Picard, Elisabeth Charlaix, J. F. Motte, Frank Fournel, Laboratoire Interdisciplinaire de Physique [Saint Martin d’Hères] (LIPhy), Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), Nanofabrication (NEEL - Nanofab), Institut Néel (NEEL), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), Commissariat à l'énergie atomique et aux énergies alternatives - Laboratoire d'Electronique et de Technologie de l'Information (CEA-LETI), Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), and Nanofab (Nanofab )
Subjects: Materials science, Mechanical Engineering, Bioengineering, Nanofluidics, 02 engineering and technology, General Chemistry, Radius, Mechanics, 021001 nanoscience & nanotechnology, Condensed Matter Physics, Tracking (particle physics), 01 natural sciences, Volumetric flow rate, Nanopore, Flow (mathematics), 0103 physical sciences, Particle, General Materials Science, [SPI.NANO]Engineering Sciences [physics]/Micro and nanotechnologies/Microelectronics, 010306 general physics, 0210 nano-technology, [PHYS.COND.CM-SCM]Physics [physics]/Condensed Matter [cond-mat]/Soft Condensed Matter [cond-mat.soft], ComputingMilieux_MISCELLANEOUS, Voltage
Abstract: Nanofluidics finds its root in the study of fluids and flows at the nanoscale. Flow rate is a quantity that is both central when dealing with flows and notoriously difficult to measure experimentally at the scale of an individual nanopore or nanochannel. We show in this letter that minute flow rate can be directly measured accumulating liquid over time within the compliant membrane of a commercial piezoresistive pressure sensor. Our flow rate sensor is versatile and can be operated independently of the nature of the liquid, flow profile, and type of nanochannel. We demonstrate this method by measuring the pressure-driven flow of silicon oil in a single nanochannel of average radius 200 nm. This approach gives reliable measurement of the flow rate up to 1 pL/min. Unlike other nanoscale flow measurements methods based, for instance, on particle tracking, our sensor delivers a direct voltage output suitable for nanoflow control applications.
Published: 2018
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6. MicroSQUID Force Microscopy in a Dilution Refrigerator

Author: Danny Hykel, Thierry Crozes, Klaus Hasselbach, Zhaosheng Wang, Gorky Shaw, K. F. Schuster, Pauline Castellazzi, beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Science, Chinese Academy of Sciences [Changchun Branch] (CAS), Nanofab (Nanofab), Institut Néel (NEEL), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF), Magnétisme et Supraconductivité (MagSup), Institut de RadioAstronomie Millimétrique (IRAM), Centre National de la Recherche Scientifique (CNRS), Ministère des Affaires Etrangères, ANR-09-BLAN-0211,TETRAFER(2009), European Project, Nanofabrication (NEEL - Nanofab), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS), and Magnétisme et Supraconductivité (NEEL - MagSup)
Subjects: Physics, Superconductivity, Field (physics), Condensed matter physics, Condensed Matter - Superconductivity, FOS: Physical sciences, Absolute value, SQUID, Condensed Matter Physics, Atomic and Molecular Physics, and Optics, Magnetic flux, law.invention, Superconductivity (cond-mat.supr-con), [PHYS.COND.CM-S]Physics [physics]/Condensed Matter [cond-mat]/Superconductivity [cond-mat.supr-con], Scanning Microscopy, law, General Materials Science, Sensitivity (control systems), Dilution refrigerator, Tuning fork, Penetration depth
Abstract: We present a new generation of a scanning MicroSQUID microscope operating in an inverted dilution refrigerator. The MicroSQUIDs have a size of 1.21$ \ \mu$m\textsuperscript{2} and a magnetic flux sensitivity of 120 $\mu\Phi_{0} / \sqrt{\textrm{Hz}}$ and thus a field sensitivity of %$550^{-6} \ \Phi_{0} / \sqrt{\textrm{Hz}}$ 550$ \ \mu \textrm{G}/ \sqrt{\textrm{Hz}}$. The scan range at low temperatures is about 80 $\mu$m and a coarse displacement of 5 mm in x and y direction has been implemented. The MicroSQUID-to-sample distance is regulated using a tuning fork based force detection. A MicroSQUID-to-sample distance of 420 nm has been obtained. The reliable knowledge of this distance is necessary to obtain a trustworthy estimate of the absolute value of the superconducting penetration depth. An outlook will be given on the ongoing direction of development.
Published: 2014
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7. Modal Decomposition in Goalpost Micro/Nano Electro-Mechanical Devices

Author: Christophe Blanc, Olivier Bourgeois, Sébastien Dufresnes, Henri Godfrin, Martial Defoort, Kunal Lulla, Eddy Collin, Jean Guidi, Ultra-basses températures (UBT), Institut Néel (NEEL), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF), Thermodynamique et biophysique des petits systèmes (TPS), Informatique et Réseaux (InfoLab), and Nanofab (Nanofab)
Subjects: Physics, Condensed Matter - Mesoscale and Nanoscale Physics, Silicon, Acoustics, FOS: Physical sciences, chemistry.chemical_element, dynamics, Condensed Matter Physics, Resonance (particle physics), Atomic and Molecular Physics, and Optics, Flexural strength, chemistry, resonance modes, Normal mode, Mesoscale and Nanoscale Physics (cond-mat.mes-hall), micro/nano-mechanics, Micro nano, Limit (music), General Materials Science, [PHYS.COND.CM-MSQHE]Physics [physics]/Condensed Matter [cond-mat]/Mesoscopic Systems and Quantum Hall Effect [cond-mat.mes-hall], Mechanical devices, Free parameter
Abstract: We have studied the first three symmetric out-of-plane flexural resonance modes of a goalpost silicon micro-mechanical device. Measurements have been performed at 4.2K in vacuum, demonstrating high Qs and good linear properties. Numerical simulations have been realized to fit the resonance frequencies and produce the mode shapes. These mode shapes are complex, since they involve distortions of two coupled orthogonal bars. Nonetheless, analytic expressions have been developed to reproduce these numerical results, with no free parameters. Owing to their generality they are extremely helpful, in particular to identify the parameters which may limit the performances of the device. The overall agreement is very good, and has been verified on our nano-mechanical version of the device., Journal of Low Temperature Physics (2013)
Published: 2013
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8. Detection of a magnetic bead by hybrid nanodevices using scanning gate microscopy

Author: Héctor Corte-León, Olga Kazakova, Alessandra Manzin, Vladimir Antonov, F. Marchi, J.-F. Motte, Patryk Krzysteczko, Hans Werner Schumacher, National Physical Laboratory [Teddington] (NPL), Nano-Optique et Forces (NOF ), Institut Néel (NEEL), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), and Nanofab (Nanofab )
Subjects: 010302 applied physics, Permalloy, [PHYS]Physics [physics], Materials science, Condensed matter physics, Magnetoresistance, General Physics and Astronomy, Scanning gate microscopy, 02 engineering and technology, Condensed Matter::Mesoscopic Systems and Quantum Hall Effect, 021001 nanoscience & nanotechnology, 01 natural sciences, lcsh:QC1-999, Magnetic field, Condensed Matter::Materials Science, Transverse plane, Ferromagnetism, Hall effect, 0103 physical sciences, 0210 nano-technology, Micromagnetics, lcsh:Physics, ComputingMilieux_MISCELLANEOUS
Abstract: Hybrid ferromagnetic(Py)/non-magnetic metal(Au) junctions with a width of 400 nm are studied by magnetotransport measurements, magnetic scanning gate microscopy (SGM) with a magnetic bead (MB) attached to the probe, and micromagnetic simulations. In the transverse geometry, the devices demonstrate a characteristic magnetoresistive behavior that depends on the direction of the in plane magnetic field, with minimum/maximum variation when the field is applied parallel/perpendicular to the Py wire. The SGM is performed with a NdFeB bead of 1.6 μm diameter attached to the scanning probe. Our results demonstrate that the hybrid junction can be used to detect this type of MB. A rough approximation of the sensing volume of the junction has the shape of elliptical cylinder with the volume of ∼1.51 μm3. Micromagnetic simulations coupled to a magnetotransport model including anisotropic magnetoresistance and planar Hall effects are in good agreement with the experimental findings, enabling the interpretation of the SGM images.
Published: 2016
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9. UV Photosensing Characteristics of Nanowire-Based GaN/AlN Superlattices

Author: Pascal Hille, Jörg Schörmann, Maria de la Mata, Martien Den Hertog, Eva Monroy, Thierry Fournier, Jonas Lähnemann, Jordi Arbiol, Martin Eickhoff, PHotonique, ELectronique et Ingénierie QuantiqueS (PHELIQS), Université Grenoble Alpes [2016-2019] (UGA [2016-2019])-Institut de Recherche Interdisciplinaire de Grenoble (IRIG), Direction de Recherche Fondamentale (CEA) (DRF (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Matériaux, Rayonnements, Structure (NEEL - MRS), Institut Néel (NEEL), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), Nanofabrication (NEEL - Nanofab), Justus-Liebig-Universität Gießen = Justus Liebig University (JLU), Departament d'Electrònica (Universitat de Barcelona) (EME/CeRMAE/IN2UB), Universitat de Barcelona (UB), Nanophysique et Semiconducteurs (NPSC), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])-Institut de Recherche Interdisciplinaire de Grenoble (IRIG), Matériaux, Rayonnements, Structure (MRS), Nanofab (Nanofab ), Justus-Liebig-Universität Gießen (JLU), Departament d'Electrònica (EME/CeRMAE/IN2UB), European Research Council, Generalitat de Catalunya, Ministerio de Economía y Competitividad (España), Agence Nationale de la Recherche (France), and State of Hesse
Subjects: Materials science, Superlattice, Nanowire, FOS: Physical sciences, Bioengineering, 02 engineering and technology, Photodetection, UV photodetector, 01 natural sciences, GaN, Photosensitivity, 0103 physical sciences, Mesoscale and Nanoscale Physics (cond-mat.mes-hall), General Materials Science, AlN, ComputingMilieux_MISCELLANEOUS, 010302 applied physics, Photocurrent, [PHYS]Physics [physics], Condensed Matter - Materials Science, Condensed Matter - Mesoscale and Nanoscale Physics, Photoluminescence spectroscopy, business.industry, Nanowires, Mechanical Engineering, Materials Science (cond-mat.mtrl-sci), Heterojunction, General Chemistry, 021001 nanoscience & nanotechnology, Condensed Matter Physics, Transmission electron microscopy, Photocurrent spectroscopy, Optoelectronics, 0210 nano-technology, business, Dark current
Abstract: arXiv:1604.07978v2, We have characterized the photodetection capabilities of single GaN nanowires incorporating 20 periods of AlN/GaN:Ge axial heterostructures enveloped in an AlN shell. Transmission electron microscopy confirms the absence of an additional GaN shell around the heterostructures. In the absence of a surface conduction channel, the incorporation of the heterostructure leads to a decrease of the dark current and an increase of the photosensitivity. A significant dispersion in the magnitude of dark currents for different single nanowires is attributed to the coalescence of nanowires with displaced nanodisks, reducing the effective length of the heterostructure. A larger number of active nanodisks and AlN barriers in the current path results in lower dark current and higher photosensitivity and improves the sensitivity of the nanowire to variations in the illumination intensity (improved linearity). Additionally, we observe a persistence of the photocurrent, which is attributed to a change of the resistance of the overall structure, particularly the GaN stem and cap sections. As a consequence, the time response is rather independent of the dark current., Financial support from the EU ERC-SG “TeraGaN” (#278428) and ANR JCJC COSMOS (ANR-12-JS10-0002) is acknowledged. Furthermore, the groups in Grenoble and Giessen received traveling support from the DAAD/Campus France program Procope. P.H., J.S., and M.E. acknowledge financial support within the LOEWE program of excellence of the Federal State of Hessen (project initiative STORE-E). M.d.l.M. and J.A. acknowledge funding from Generalitat de Catalunya 2014 SGR 1638 and the Spanish MINECO MAT2014-51480-ERC (e-ATOM) and Severo Ochoa Excellence Program.
Published: 2016
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10. A quantitative study of magnetic interactions between a micro-magnet array and individual magnetic micro-particles by scanning particle force microscopy

Author: D. Givord, H Marelli, Florence Marchi, Svetlana Ponomareva, B Royer, Nora M. Dempsey, J.-F. Motte, Frédéric Dumas-Bouchiat, Andre Dias, Micro et NanoMagnétisme (MNM ), Institut Néel (NEEL), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), Universidade Nova de Lisboa = NOVA University Lisbon (NOVA), Nanofab (Nanofab ), IRCER - Axe 2 : procédés plasmas et lasers (IRCER-AXE2), Institut de Recherche sur les CERamiques (IRCER), Institut des Procédés Appliqués aux Matériaux (IPAM), Université de Limoges (UNILIM)-Université de Limoges (UNILIM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut des Procédés Appliqués aux Matériaux (IPAM), Université de Limoges (UNILIM)-Université de Limoges (UNILIM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Nano-Optique et Forces (NOF ), and Tomsk Polytechnic University (Russia)
Subjects: Materials science, magnetic force simulations, micro-particle probe fabrication, 02 engineering and technology, Magnetic particle inspection, [SPI]Engineering Sciences [physics], Magnetization, Microscopy, [PHYS.COND]Physics [physics]/Condensed Matter [cond-mat], [SPI.NANO]Engineering Sciences [physics]/Micro and nanotechnologies/Microelectronics, Electrical and Electronic Engineering, Condensed matter physics, Mechanical Engineering, force quantification, Hard spheres, 021001 nanoscience & nanotechnology, Electronic, Optical and Magnetic Materials, Magnetic field, Mechanics of Materials, Magnet, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], Magnetic nanoparticles, hard micro-magnet array, 0210 nano-technology, magnetic particle force microscopy, Superparamagnetism
Abstract: International audience; Magnetic particle force microscopy has been used to measure magnetic interactions between an array of thermomagnetically patterned hard micro-magnets and both hard magnetic and superparamagnetic microspheres. Maximum interaction forces are experienced when the microspheres scan over the interface between reversed and non-reversed zones, where the stray magnetic field produced by the micro-magnet array is maximum. Comparison of experimental and simulated force maps of the hard spheres is used to validate assumptions concerning the remanent magnetisation and depth of the reversed zones. This information is in turn used to deduce the content of magnetic nanoparticles in the superparamagnetic spheres. Asymmetries in the experimental force maps of hard spheres are attributed to (i) the existence of a weak in-plane component of the force and (ii) the fact that the transition between two regions with opposite magnetization direction is not abrupt.
Published: 2018
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11. Magnetization reversal of a single cobalt cluster using a RF field pulse

Author: Véronique Dupuis, T. Fournier, Cécile Raufast, Edgar Bonet, Wolfgang Wernsdorfer, T. Crozes, E. Bernstein, Alexandre Tamion, Laboratoire de Physique de la Matière Condensée et Nanostructures (LPMCN), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon, Circuits électroniques quantiques Alpes (QuantECA), Institut Néel (NEEL), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS), and Nanofab (Nanofab)
Subjects: [PHYS]Physics [physics], Physics, Spins, Condensed matter physics, Resonance, 02 engineering and technology, Nanosecond, 021001 nanoscience & nanotechnology, Condensed Matter Physics, 01 natural sciences, Electronic, Optical and Magnetic Materials, Pulse (physics), Geomagnetic reversal, law.invention, Magnetic field, SQUID, Magnetic anisotropy, law, 0103 physical sciences, 010306 general physics, 0210 nano-technology
Abstract: International audience; Technological improvements require the understanding of dynamical magnetization reversal processes at the nanosecond time scales. In this paper, we present the first magnetization reversal measurements performed on a single cobalt cluster (counting only a thousand of spins), using the micro-superconducting quantum interference device (SQUID) technique by applying a constant magnetic field combined with a radio-frequency (RF) field pulse. First of all, we present the different technical steps necessary to detect the magnetic reversals at low temperature (T = 35 mK) of a well-defined nanoparticle prepared by low energy clusters beam deposition (LECBD). We previously showed that the three-dimensional (3D)-switching Stoner-Wohlfarth astroid represents the magnetic anisotropy of the nanoparticle. Then, an improved device coupled with a gold stripeline, allow us to reverse such macrospin, using a RF pulse. A qualitative understanding of the magnetization reversal by non-linear resonance has been obtained with the Landau-Lifschitz-Gilbert (LLG) equation.
Published: 2010
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12. Magnetic scanning gate microscopy of a domain wall nanosensor using microparticle probe

Author: F. Marchi, J.-F. Motte, Boris Gribkov, Olga Kazakova, Vladimir Antonov, Hans Werner Schumacher, Patryk Krzysteczko, Héctor Corte-León, National Physical Laboratory [Teddington] (NPL), Nano-Optique et Forces (NOF ), Institut Néel (NEEL), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), and Nanofab (Nanofab )
Subjects: 010302 applied physics, [PHYS]Physics [physics], Nanostructure, Materials science, Silicon, business.industry, chemistry.chemical_element, Nanotechnology, Scanning gate microscopy, 02 engineering and technology, 021001 nanoscience & nanotechnology, Condensed Matter Physics, 01 natural sciences, Electronic, Optical and Magnetic Materials, Domain wall (magnetism), Neodymium magnet, chemistry, Electrical resistance and conductance, Nanosensor, 0103 physical sciences, Optoelectronics, Magnetic force microscope, 0210 nano-technology, business, ComputingMilieux_MISCELLANEOUS
Abstract: We apply the magnetic scanning gate microscopy (SGM) technique to study the interaction between a magnetic bead (MB) and a domain wall (DW) trapped in an L-shaped magnetic nanostructure. Magnetic SGM is performed using a custom-made probe, comprising a hard magnetic NdFeB bead of diameter 1.6 µm attached to a standard silicon tip. The MB–DW interaction is detected by measuring changes in the electrical resistance of the device as a function of the tip position. By scanning at different heights, we create a 3D map of the MB–DW interaction and extract the sensing volume for different widths of the nanostructure's arms. It is shown that for 50 nm wide devices the sensing volume is a cone of 880 nm in diameter by 1.4 µm in height, and reduces down to 800 nm in height for 100 nm devices with almost no change in its diameter.
Published: 2016
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13. Reversibility Of Superconducting Nb Weak Links Driven By The Proximity Effect In A Quantum Interference Device

Author: Thierry Fournier, Hervé Courtois, Nikhil Kumar, Clemens Winkelmann, Anjan K. Gupta, Department of Physics [Kanpur], Indian Institute of Technology Kanpur (IIT Kanpur), Nanofab (Nanofab), Institut Néel (NEEL), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF), and Nano-Electronique Quantique et Spectroscopie (QuNES)
Subjects: Physics, Superconductivity, Condensed matter physics, Condensed Matter - Superconductivity, Phase (waves), FOS: Physical sciences, General Physics and Astronomy, Nanotechnology, 02 engineering and technology, 021001 nanoscience & nanotechnology, Small amplitude, 01 natural sciences, [PHYS.PHYS.PHYS-GEN-PH]Physics [physics]/Physics [physics]/General Physics [physics.gen-ph], 3. Good health, Superconductivity (cond-mat.supr-con), Condensed Matter::Superconductivity, Heat generation, 0103 physical sciences, Thermal, Quantum interference, Proximity effect (superconductivity), Critical current, 010306 general physics, 0210 nano-technology
Abstract: We demonstrate the role of proximity effect in the thermal hysteresis of superconducting constrictions. From the analysis of successive thermal instabilities in the transport characteristics of micron-size superconducting quantum interference devices with a well-controlled geometry, we obtain a complete picture of the different thermal regimes. These determine whether the junctions are hysteretic or not. Below the superconductor critical temperature, the critical current switches from a classical weak-link behavior to one driven by the proximity effect. The associated small amplitude of the critical current makes it robust with respect to the heat generation by phase-slips, leading to a non-hysteretic behavior., 6 pages, 5 figures, including Supplementary Information
Published: 2015
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14. Transverse voltage in a quasi-one-dimensional NbSe3 conductor with a charge density wave in zero magnetic field

Author: Pierre Monceau, A. A. Sinchenko, Thierry Crozes, Kotelnikov Institute of Radio Engineering and Electronics (IRE), Russian Academy of Sciences [Moscow] (RAS), Magnétisme et Supraconductivité (MagSup), Institut Néel (NEEL), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF), Nanofab (Nanofab), and Laboratoire international associé 'Physique des états électroniques cohérents en matière condensée (PEECMC) entre le CNRS et l'Académie des Sciences de Russie.
Subjects: Physics, Phase transition, Physics and Astronomy (miscellaneous), Condensed matter physics, Peierls transition, Optical field, Condensed Matter::Mesoscopic Systems and Quantum Hall Effect, 01 natural sciences, 010305 fluids & plasmas, Magnetic field, Electric field, 0103 physical sciences, Electric potential, [PHYS.COND.CM-SCE]Physics [physics]/Condensed Matter [cond-mat]/Strongly Correlated Electrons [cond-mat.str-el], 010306 general physics, Charge density wave, Voltage
Abstract: The appearance of an electric field component normal to the transport current has been revealed in NbSe3 single crystals in the region of phase transitions to the Peierls state. It has been shown that the arising transverse voltage is V xy ∝ dR xx /dT. This effect is explained by the redistribution of the current caused by the spatial inhomogeneity of the critical temperature of the Peierls transition.
Published: 2011
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15. Heat transmission between a profiled nanowire and a thermal bath

Author: Thierry Fournier, Jean-Savin Heron, Olivier Bourgeois, Christophe Blanc, Thermodynamique et biophysique des petits systèmes (TPS), Institut Néel (NEEL), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF), and Nanofab (Nanofab)
Subjects: Thermal contact conductance, [PHYS]Physics [physics], Materials science, Physics and Astronomy (miscellaneous), Condensed matter physics, Thermal resistance, Nanowire, Thermal contact, Nanotechnology, Thermal conduction, Thermal conductivity, Thermal, Heat transfer, ComputingMilieux_MISCELLANEOUS
Abstract: Thermal transport through profiled and abrupt contacts between a nanowire and a reservoir has been investigated by thermal conductance measurements. It is demonstrated that above 1 K the transmission coefficients are identical between abrupt and profiled junctions. This shows that the thermal transport is principally governed by the nanowire itself rather than by the resistance of the thermal contact. These results are perfectly compatible with the previous theoretical models. The thermal conductance measured at sub-Kelvin temperatures is discussed in relation to the universal value of the quantum of thermal conductance.
Published: 2014
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16. Phonon Heat Conduction in Corrugated Silicon Nanowires Below the Casimir Limit

Author: Olivier Bourgeois, Ali Rajabpour, Thierry Fournier, Sebastian Volz, Christophe Blanc, Thermodynamique et biophysique des petits systèmes (TPS), Institut Néel (NEEL), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF), Department of Mechanical Engineering, Imam Khomeini International University (IKIU), Laboratoire d'Énergétique Moléculaire et Macroscopique, Combustion (EM2C), Université Paris Saclay (COmUE)-Centre National de la Recherche Scientifique (CNRS)-CentraleSupélec, and Nanofab (Nanofab)
Subjects: Materials science, Physics and Astronomy (miscellaneous), Silicon, Mean free path, Phonon, Nanowire, chemistry.chemical_element, FOS: Physical sciences, Physics::Optics, 02 engineering and technology, 01 natural sciences, Monocrystalline silicon, Condensed Matter::Materials Science, Thermal conductivity, 0103 physical sciences, Mesoscale and Nanoscale Physics (cond-mat.mes-hall), 010306 general physics, [PHYS.COND.CM-MSQHE]Physics [physics]/Condensed Matter [cond-mat]/Mesoscopic Systems and Quantum Hall Effect [cond-mat.mes-hall], Condensed matter physics, Condensed Matter - Mesoscale and Nanoscale Physics, Scattering, 021001 nanoscience & nanotechnology, Thermal conduction, Condensed Matter::Mesoscopic Systems and Quantum Hall Effect, chemistry, 0210 nano-technology
Abstract: hh; The thermal conductance of straight and corrugated monocrystalline silicon nanowires has been measured between 0.3~K and 5~K. The difference in the thermal transport between corrugated nanowires and straight ones demonstrates a strong reduction in the mean free path of the phonons. This averaged mean free path is remarkably smaller than the smaller diameter of the nanowire, evidencing a phonon thermal transport reduced below the Casimir limit. Monte Carlo simulations highlight that this effect can be attributed to significant multiple scattering of ballistic phonons occuring on the corrugated surfaces. This result suggests an original approach to transforming a monocrystalline material into a phonon glass.
Published: 2013
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17. Correlation of polarity and crystal structure with optoelectronic and transport properties of GaN/AlN/GaN nanowire sensors

Author: Eva Monroy, R. Songmuang, B. Fernandez, Jean-Luc Rouvière, T. Fournier, M. den Hertog, F. Gonzalez-Posada, Matériaux, Rayonnements, Structure (NEEL - MRS), Institut Néel (NEEL), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS), Service de Physique des Matériaux et Microstructures (SP2M - UMR 9002), Institut Nanosciences et Cryogénie (INAC), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), Nanophysique et Semiconducteurs (NEEL - NPSC), Laboratoire d'Etude des Matériaux par Microscopie Avancée (LEMMA ), Modélisation et Exploration des Matériaux (MEM), Université Grenoble Alpes [2016-2019] (UGA [2016-2019])-Institut de Recherche Interdisciplinaire de Grenoble (IRIG), Direction de Recherche Fondamentale (CEA) (DRF (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])-Institut de Recherche Interdisciplinaire de Grenoble (IRIG), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Nanofabrication (NEEL - Nanofab), Nanophysique et Semiconducteurs (NPSC), PHotonique, ELectronique et Ingénierie QuantiqueS (PHELIQS), ANR-11-NANO-0027,UVLamp,Lampes Ultra Violet à base de Nanostructures en III-nitrures, pompées électroniquement par des cathodes en nanotubes de carbone(2011), European Project: 278428,EC:FP7:ERC,ERC-2011-StG_20101014,TERAGAN(2012), Matériaux, Rayonnements, Structure (MRS), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), Nanofab (Nanofab), SMINGUE FMN 2011: TEMPO, Institut de Recherche Interdisciplinaire de Grenoble (IRIG), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Grenoble Alpes (UGA)-Institut de Recherche Interdisciplinaire de Grenoble (IRIG), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Grenoble Alpes (UGA)
Subjects: Materials science, Polarity (physics), Nanowire, Bioengineering, 02 engineering and technology, Crystal structure, photocurrent, 01 natural sciences, GaN, sensor, 0103 physical sciences, Scanning transmission electron microscopy, General Materials Science, polarity, 010302 applied physics, Photocurrent, business.industry, Mechanical Engineering, General Chemistry, 021001 nanoscience & nanotechnology, Condensed Matter Physics, Characterization (materials science), scanning transmission electron microscopy, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], Optoelectronics, 0210 nano-technology, business
Abstract: International audience; GaN nanowires (NWs) with an AlN insertion were studied by correlated optoelectronic and aberration-corrected scanning transmission electron microscopy (STEM) characterization on the same single NW. Using aberration-corrected annular bright field and high angle annular dark field STEM, we identify the NW growth axis to be the N-polar [000−1] direction. The electrical transport characteristics of the NWs are explained by the polarization-induced asymmetric potential profile and by the presence of an AlN/GaN shell around the GaN base of the wire. The AlN insertion blocks the electron flow through the GaN core, confining the current to the radial GaN outer shell, close to the NW sidewalls, which increases the sensitivity of the photocurrent to the environment and in particular to the presence of oxygen. The desorption of oxygen adatoms in vacuum leads to a reduction of the nonradiative surface trap density, increasing both dark current and photocurrent.
Published: 2012
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18. Size dependence of exchange bias in Co/CoO nanostructures

Author: Eric Prestat, Dominique Givord, Olivier Bourgeois, Helge Haas, Sara Laureti, Sarah Y. Suck, Thermodynamique et biophysique des petits systèmes (TPS), Institut Néel (NEEL), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF), Nanofab (Nanofab), and Micro et NanoMagnétisme (MNM)
Subjects: 010302 applied physics, Materials science, Nanostructure, Characteristic length, Condensed matter physics, Field (physics), General Physics and Astronomy, 02 engineering and technology, Coercivity, 021001 nanoscience & nanotechnology, 01 natural sciences, Exchange bias, 0103 physical sciences, Antiferromagnetism, Coupling (piping), 0210 nano-technology, Size dependence, ComputingMilieux_MISCELLANEOUS, [PHYS.COND.CM-MSQHE]Physics [physics]/Condensed Matter [cond-mat]/Mesoscopic Systems and Quantum Hall Effect [cond-mat.mes-hall], exchange bias, size confinement
Abstract: In Co=CoO nanostructures, of dimensions l 3l, at small Co thickness ( 6; 10 nm), a strong increase in the bias field and the associated coercive field are found as the nanostructure size is reduced from l ¼ 120 nm to l ¼ 30 nm. This property indicates that the vharacteristic length DAF within the antiferromagnet which governs exchange-bias effects is the nanostructure size. By contrast, at larger Co thickness ( 23 nm), the exchange-bias field does not depend on the nanostructure size, implying that DAF is smaller than the nanostructure size. The results are discussed in the framework of the Malozemoff model, taking into account that the coupling between CoO grains is weak. Exchange bias is dominated either by coupling within the antiferromagnetic layer (6- and 10-nm-thick Co samples) or by ferromagnetic-antiferromagnetic interfacial coupling (23-nm-thick Co sample).
Published: 2012
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19. Transverse Conductivity in the Sliding Charge-Density-Wave State ofNbSe3

Author: A. A. Sinchenko, Thierry Crozes, Pierre Monceau, Moscow Engineering-Physics Institute, Magnétisme et Supraconductivité (MagSup), Institut Néel (NEEL), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF), Nanofab (Nanofab), Laboratoire international associé 'Physique des états électroniques cohérents en matière condensée (PEECMC) entre le CNRS et l'Académie des Sciences de Russie., and ANR-07-BLAN-0136,LoMaCoQuP,Local manipulation of collective quantum processes in correlated electronic states(2007)
Subjects: Physics, Condensed matter physics, General Physics and Astronomy, Transverse wave, 02 engineering and technology, Conductivity, 021001 nanoscience & nanotechnology, Thermal conduction, 01 natural sciences, Transverse plane, Electric field, 0103 physical sciences, [PHYS.COND.CM-SCE]Physics [physics]/Condensed Matter [cond-mat]/Strongly Correlated Electrons [cond-mat.str-el], Current (fluid), 010306 general physics, 0210 nano-technology, Charge density wave, Voltage
Abstract: International audience; The dynamical properties of longitudinal and transverse conduction of NbSe3 single crystals have been simultaneously studied when the current is applied along the b axis (chain direction). In the vicinity of the threshold electric field for charge-density-wave sliding, the transverse conduction sharply decreases. When a rf field is applied, voltage Shapiro steps for longitudinal transport are observed as usual but also current Shapiro steps in the transverse direction. The possible mechanisms of this effect are discussed.
Published: 2012
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20. Ultra-smooth single crystal diamond surfaces resulting from implantation and lift-off processes

Author: C. Peaucelle, Paolo Olivero, Etienne Bustarret, David Eon, Etienne Gheeraert, T. N. Tran Thi, Jürgen Härtwig, B. Fernandez, T. A. Lafford, A. Perrat-Mabilon, Semi-conducteurs à large bande interdite (SC2G), Institut Néel (NEEL), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF), Nanofab (Nanofab), European Synchrotron Radiation Facility (ESRF), Institut de Physique Nucléaire de Lyon (IPNL), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Faculty of Mathematics, Physics and Natural Sciences, and Università degli studi di Torino (UNITO)
Subjects: Materials science, Annealing (metallurgy), Single crystal diamond, Analytical chemistry, FOS: Physical sciences, 02 engineering and technology, Surface finish, engineering.material, 01 natural sciences, Fluence, 0103 physical sciences, Materials Chemistry, Surface roughness, [SPI.GPROC]Engineering Sciences [physics]/Chemical and Process Engineering, Electrical and Electronic Engineering, 010302 applied physics, Condensed Matter - Materials Science, Diamond, Materials Science (cond-mat.mtrl-sci), Surfaces and Interfaces, Plasma, 021001 nanoscience & nanotechnology, Condensed Matter Physics, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials, Lift (force), engineering, 0210 nano-technology
Abstract: A method for obtaining a smooth, single crystal diamond surface is presented, whereby a sacrificial defective layer is created by implantation and graphitized by annealing before being selectively etched. We have used O+ at 240 keV, the main process variables being the ion fluence (ranging from 3x10^15 cm^-2 to 3x10^17 cm^-2) and the final etching process (wet etch, H2 plasma and annealing in air). The substrates were characterized by atomic force microscopy, optical profilometry and white beam X-ray topography. The influence of the various process parameters on the resulting lift-off efficiency and final surface roughness is discussed. An O+ fluence of 2x10^17 cm^-2 was found to result in sub-nanometre roughness over tens of um^2., Comment: 4 pages, 4 figures
Published: 2011
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21. Bistable Coupling States Measured on Single Co Nanoclusters Deposited on CoO(111)

Author: Thierry Crozes, S. Pouget, Wolfgang Wernsdorfer, R. Morel, L. Notin, D. Le Roy, Ariel Brenac, Service de Physique Statistique, Magnétisme et Supraconductivité (SPSMS - UMR 9001), Institut Nanosciences et Cryogénie (INAC), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), Nanostructures et Magnétisme (NM), Service de Physique des Matériaux et Microstructures (SP2M - UMR 9002), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])-Institut Nanosciences et Cryogénie (INAC), Nanofab (Nanofab), Institut Néel (NEEL), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF), Circuits électroniques quantiques Alpes (QuantECA), Nanofabrication (NEEL - Nanofab), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS), and Circuits électroniques quantiques Alpes (NEEL - QuantECA)
Subjects: Superconductivity, Coupling, [PHYS]Physics [physics], Materials science, Condensed matter physics, Bistability, Magnetism, General Physics and Astronomy, 02 engineering and technology, 021001 nanoscience & nanotechnology, 01 natural sciences, Nanoclusters, Magnetic anisotropy, 0103 physical sciences, Cluster (physics), 010306 general physics, 0210 nano-technology, Bar (unit)
Abstract: International audience; We describe novel features of the induced magnetic anisotropy in Co nanoclusters coupled with a CoO(111) layer. Individual cluster magnetism was studied using new microbridge superconducting quantum interference devices. Intrinsically, the Co clusters are single domains with an effective anisotropy constant K-F approximate to 1.5 x 10(6) erg . cm(-3). A bistable state of the ferromagnetic-antiferromagnetic coupling is revealed, with a maximum bias systematically observed along CoO[10 (1) over bar] and an interfacial coupling energy of 0.9 erg . cm(-2). The small bias observed in cluster assembly results from an averaging over the two opposite stable states.
Published: 2011
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22. Persistence of superconductivity in niobium ultrathin films grown on R-plane sapphire

Author: Vincent Bouchiat, Luc Ortega, Bernard Pannetier, Thierry Fournier, Thierry Crozes, Cécile Delacour, Marc Faucher, Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 (IEMN), Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF), Thermodynamique et biophysique des petits systèmes (TPS), Institut Néel (NEEL), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF), X'Press (X'Press), Nanofab (Nanofab), Circuits électroniques quantiques Alpes (QuantECA), and Systèmes hybrides de basse dimensionnalité (HYBRID)
Subjects: Nanostructure, Materials science, Niobium, chemistry.chemical_element, FOS: Physical sciences, Nanotechnology, 02 engineering and technology, Superconducting films and low-dimensional structures, 01 natural sciences, growth from vapor phase, Superconductivity (cond-mat.supr-con), 0103 physical sciences, Monolayer, Mesoscale and Nanoscale Physics (cond-mat.mes-hall), Wafer, Vapor phase epitaxy, 010306 general physics, [PHYS.COND.CM-MSQHE]Physics [physics]/Condensed Matter [cond-mat]/Mesoscopic Systems and Quantum Hall Effect [cond-mat.mes-hall], Superconductivity, Condensed Matter - Mesoscale and Nanoscale Physics, business.industry, Condensed Matter - Superconductivity, 021001 nanoscience & nanotechnology, Condensed Matter Physics, Electronic, Optical and Magnetic Materials, Nanolithography, chemistry, Sapphire, Optoelectronics, Crystallite, 0210 nano-technology, business
Abstract: We report on a combined structural and electronic analysis of niobium ultrathin films (from 2 to 10 nm) deposited in ultra-high vacuum on atomically flat R-plane sapphire wafers. A textured polycrystalline morphology is observed for the thinnest films showing that hetero-epitaxy is not achieved under a thickness of 3.3nm, which almost coincides with the first measurement of a superconducting state. The superconducting critical temperature rise takes place on a very narrow thickness range, of the order of a single monolayer (ML). The thinnest superconducting sample (3 nm/9ML) has an offset critical temperature above 4.2K and can be processed by standard nanofabrication techniques to generate air- and time-stable superconducting nanostructures, useful for quantum devices., Comment: 22 pages, 8 figures, to appear in Physical Review B (2011)
Published: 2011
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23. Blocking phonons via nanoscale geometrical design

Author: Natalio Mingo, J. S. Heron, Chandan Bera, Olivier Bourgeois, Thierry Fournier, Thermodynamique et biophysique des petits systèmes (TPS), Institut Néel (NEEL), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF), and Nanofab (Nanofab)
Subjects: Materials science, Condensed matter physics, Phonon, business.industry, Nanowire, 02 engineering and technology, Atmospheric temperature range, 021001 nanoscience & nanotechnology, Condensed Matter Physics, Thermal conduction, 01 natural sciences, Electronic, Optical and Magnetic Materials, law.invention, Thermal conductivity, law, 0103 physical sciences, Thermal, Optoelectronics, Resistor, 010306 general physics, 0210 nano-technology, business, Order of magnitude, ComputingMilieux_MISCELLANEOUS, [PHYS.COND.CM-MSQHE]Physics [physics]/Condensed Matter [cond-mat]/Mesoscopic Systems and Quantum Hall Effect [cond-mat.mes-hall]
Abstract: By introducing a serpentine structure in a straight silicon nanowire, we have experimentally achieved a significant reduction in its phonon thermal conductance at low temperature $(Tl5\text{ }\text{K}.)$ The magnitude of this effect is one order of magnitude larger than expected based on a thermal resistors picture. With a more refined theoretical model that considers the frequency dependence of phonon transport, we are able to quantitatively account for the experimental results of straight and serpentine nanowires in the whole temperature range. This experimental demonstration of a large, purely geometry induced effect on nanoscale thermal conductance contrasts strikingly with the negligible effects reported on a different nanoscale system in a previous publication.
Published: 2010
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24. Mesoscopic size effects on the thermal conductance of silicon nanowire

Author: T. Fournier, N. Mingo, J. S. Heron, Olivier Bourgeois, Thermodynamique et biophysique des petits systèmes (TPS), Institut Néel (NEEL), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF), and Nanofab (Nanofab)
Subjects: Materials science, Characteristic length, Silicon, Phonon, Nanowire, chemistry.chemical_element, Bioengineering, 02 engineering and technology, Surface finish, 01 natural sciences, Thermal conductivity, 0103 physical sciences, General Materials Science, 010306 general physics, ComputingMilieux_MISCELLANEOUS, [PHYS.COND.CM-MSQHE]Physics [physics]/Condensed Matter [cond-mat]/Mesoscopic Systems and Quantum Hall Effect [cond-mat.mes-hall], Mesoscopic physics, Condensed matter physics, Mechanical Engineering, General Chemistry, Condensed Matter::Mesoscopic Systems and Quantum Hall Effect, 021001 nanoscience & nanotechnology, Condensed Matter Physics, Wavelength, chemistry, 0210 nano-technology
Abstract: We report the measurement of thermal conductance of silicon nanowires at low temperature. It is demonstrated that the roughness at the nanometer scale plays a crucial role for the phonon transport in low-dimensional samples. To this end, using e-beam lithography, nanowires of size 200 nm by 100 nm and 10 microm long have been nanofabricated. Their thermal properties have been measured using the 3 omega method between 0.3 and 6 K. The change in the temperature behavior of the thermal conductance (quadratic temperature dependence of K(T)) is a signature of an intermediate regime lying between the classical Casimir regime and the quantum regime. The Casimir-Ziman model is used to show that this specific behavior originates in mesoscopic samples where the dominant phonon wavelength becomes commensurate to the characteristic length of the roughness of the nanowire surfaces.
Published: 2009
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25. Temperature modulation measurements of the thermal properties of nanosystems at low temperatures

Author: Florian R. Ong, Jean-Savin Heron, Philippe Gandit, Thierry Fournier, Germain Souche, Olivier Bourgeois, Thermodynamique et biophysique des petits systèmes (TPS), Institut Néel (NEEL), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF), Hélium : du fondamental aux applications (HELFA), and Nanofab (Nanofab)
Subjects: Materials science, Mean free path, Nanowire, Thermodynamics, Calorimetry, Condensed Matter Physics, 7. Clean energy, 01 natural sciences, Heat capacity, Atomic and Molecular Physics, and Optics, 010305 fluids & plasmas, Temperature gradient, Thermal conductivity, Chemical physics, Modulation, 0103 physical sciences, Thermal, General Materials Science, 010306 general physics, ComputingMilieux_MISCELLANEOUS, [PHYS.COND.CM-MSQHE]Physics [physics]/Condensed Matter [cond-mat]/Mesoscopic Systems and Quantum Hall Effect [cond-mat.mes-hall]
Abstract: We report on the dynamic measurements of thermal properties of nanosystems at very low temperatures. These techniques are based on the modulation of the temperature and hence leads to highly sensitive measurements. We will discuss the intrinsic limitations of these methods when the thermal properties of nano-objects are studied at very low temperatures, much below 1 K. Firstly, we will present thermal conductance measurements using the 3ω method. This technique is limited at low temperatures due to the significant increase of the mean free path. Secondly, heat capacity measurements using ac calorimetry are outlined, and again restrictions occur due to the continuous temperature gradient inherent to that technique. Propositions are made in order to overcome these limitations.
Published: 2009
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26. Spin-Valve Effect of the Spin Accumulation Resistance in a Double Ferromagnet - Superconductor Junction

Author: B. Gilles, Hervé Courtois, Bernard Pannetier, Sukumar Rajauria, Thierry Crozes, P. S. Luo, Champion, Yannick, Nanofab (Nanofab), Institut Néel (NEEL), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS), Science et Ingénierie des Matériaux et Procédés (SIMaP), Université Joseph Fourier - Grenoble 1 (UJF)-Centre National de la Recherche Scientifique (CNRS)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut de Chimie du CNRS (INC)-Institut National Polytechnique de Grenoble (INPG), Circuits électroniques quantiques Alpes (QuantECA), Nano-Electronique Quantique et Spectroscopie (QuNES), ANR-07-NANO-0011,ELEC-EPR,Electronic EPR Source(2007), and Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National Polytechnique de Grenoble (INPG)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Nanostructure, Materials science, Spin valve, FOS: Physical sciences, 02 engineering and technology, 01 natural sciences, Superconductivity (cond-mat.supr-con), Magnetization, Condensed Matter::Materials Science, Condensed Matter::Superconductivity, 0103 physical sciences, Proximity effect (superconductivity), 010306 general physics, ComputingMilieux_MISCELLANEOUS, Spin-½, Superconductivity, [CHIM.MATE] Chemical Sciences/Material chemistry, Condensed matter physics, Condensed Matter - Superconductivity, [CHIM.MATE]Chemical Sciences/Material chemistry, 021001 nanoscience & nanotechnology, Condensed Matter Physics, Condensed Matter::Mesoscopic Systems and Quantum Hall Effect, Electronic, Optical and Magnetic Materials, [PHYS.COND.CM-S]Physics [physics]/Condensed Matter [cond-mat]/Superconductivity [cond-mat.supr-con], Ferromagnetism, Electrode, Condensed Matter::Strongly Correlated Electrons, 0210 nano-technology
Abstract: International audience; We have measured the transport properties of Ferromagnet - Superconductor nanostructures, where two superconducting aluminum (Al) electrodes are connected through two ferromagnetic iron (Fe) ellipsoids in parallel. We find that, below the superconducting critical temperature of Al, the resistance depends on the relative alignment of the ferromagnets' magnetization. This spin-valve effect is analyzed in terms of spin accumulation in the superconducting electrode submitted to inverse proximity effect.
Published: 2008
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27. Microwave-Assisted Magnetization Reversal in Individual Isolated Clusters of Cobalt

Author: Wolfgang Wernsdorfer, E. Bernstein, Véronique Dupuis, T. Tournier, Edgar Bonet, T. Crozes, Alexandre Tamion, Cécile Raufast, Consortium de Recherches pour l'Emergence des Technologies Avancées (CRETA), Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), Laboratoire de Physique de la Matière Condensée et Nanostructures (LPMCN), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon, Nanofab (Nanofab), Institut Néel (NEEL), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS), and Circuits électroniques quantiques Alpes (QuantECA)
Subjects: Physics, [PHYS]Physics [physics], Spins, Condensed matter physics, 02 engineering and technology, Nanosecond, 021001 nanoscience & nanotechnology, 01 natural sciences, Electronic, Optical and Magnetic Materials, Magnetic field, Geomagnetic reversal, Magnetic anisotropy, Nonlinear resonance, 0103 physical sciences, Magnetic nanoparticles, Electrical and Electronic Engineering, 010306 general physics, 0210 nano-technology, Superparamagnetism
Abstract: International audience; At the nanometric range, the superparamagnetic state has become a crucial issue in fundamental research as well as practical applications. In both cases, technological improvements require understanding dynamical magnetization reversal processes at the nanosecond time scales. In this paper, we present the first magnetization reversal measurements performed on a single cobalt cluster (counting only 1000 spins) using the micro-SQUID technique by applying a constant magnetic field combined with a radio-frequency field pulse. First of all, we present the different technical steps necessary to detect the magnetic reversals at low temperature (T = 35 mK) of a well-defined nanoparticle prepared by low-energy clusters beam deposition. We previously showed that the 3-D switching Stoner-Wohlfarth astroid represents the magnetic anisotropy of the nanoparticle. Then, an improved device, coupled with a gold stripe line, allow us to reverse such a macrospin using an RF pulse. A qualitative understanding of the magnetization reversal by nonlinear resonance has been obtained with the Landau-Lifschitz-Gilbert equation.
Published: 2008
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28. Andreev current-induced dissipation in a hybrid superconducting tunnel junction

Author: Hervé Courtois, Frank W. J. Hekking, Bernard Pannetier, Philippe Gandit, Thierry Fournier, Sukumar Rajauria, Circuits électroniques quantiques Alpes (QuantECA), Institut Néel (NEEL), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF), Hélium : du fondamental aux applications (HELFA), Nanofab (Nanofab), Laboratoire de physique et modélisation des milieux condensés (LPM2C), Université Joseph Fourier - Grenoble 1 (UJF)-Centre National de la Recherche Scientifique (CNRS), and Nano-Electronique Quantique et Spectroscopie (QuNES)
Subjects: Superconductivity, Materials science, Condensed matter physics, Condensed Matter - Superconductivity, FOS: Physical sciences, General Physics and Astronomy, 02 engineering and technology, Dissipation, 021001 nanoscience & nanotechnology, Condensed Matter::Mesoscopic Systems and Quantum Hall Effect, 01 natural sciences, 7. Clean energy, Superconductivity (cond-mat.supr-con), [PHYS.COND.CM-S]Physics [physics]/Condensed Matter [cond-mat]/Superconductivity [cond-mat.supr-con], Tunnel junction, Condensed Matter::Superconductivity, 0103 physical sciences, Quasiparticle, Superconducting tunnel junction, Current (fluid), 010306 general physics, 0210 nano-technology, Joule heating, Quantum tunnelling
Abstract: International audience; We have studied hybrid superconducting micro-coolers made of a double Superconductor-Insulator-Normal metal tunnel junction. Under subgap conditions, the Andreev current is found to dominate the single-particle tunnel current. We show that the Andreev current introduces additional dissipation in the normal metal equivalent to Joule heating. By analyzing quantitatively the heat balance in the system, we provide a full description of the evolution of the electronic temperature with the voltage. The dissipation induced by the Andreev current is found to dominate the quasiparticle tunneling-based cooling over a large bias range.
Published: 2008
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29. Silicon Vibrating Wires at Low Temperatures

Author: Yuriy M. Bunkov, Henri Godfrin, Laure Filleau, Thierry Fournier, Eddy Collin, Ultra-basses températures (UBT), Institut Néel (NEEL), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF), and Nanofab (Nanofab)
Subjects: Field (physics), Silicon, chemistry.chemical_element, FOS: Physical sciences, 02 engineering and technology, dissipation process, 01 natural sciences, 0103 physical sciences, Mesoscale and Nanoscale Physics (cond-mat.mes-hall), General Materials Science, 010306 general physics, [PHYS.COND.CM-MSQHE]Physics [physics]/Condensed Matter [cond-mat]/Mesoscopic Systems and Quantum Hall Effect [cond-mat.mes-hall], Microelectromechanical systems, Physics, Condensed Matter - Mesoscale and Nanoscale Physics, business.industry, Resonance, 021001 nanoscience & nanotechnology, Condensed Matter Physics, Atomic and Molecular Physics, and Optics, Magnetic flux, Magnetic field, chemistry, viscosity, Optoelectronics, Micromechanics, 0210 nano-technology, business, Vibrating wire, Microfabrication
Abstract: Nowadays microfabrication techniques originating from micro-electronics enable to create mechanical objects of micron-size. The field of Micro-Electro-Mechanical devices (MEMS) is continuously expanding, with an amazingly broad range of applications at room temperature. Vibrating objects (torsional oscillators, vibrating wires) widely used at low temperatures to study quantum fluids, can be replaced advantageously by Silicon MEMS. In this letter we report on the study of Silicon vibrating wire devices. A goal-post structure covered with a metal layer is driven at resonance by the Laplace force acting on a current in a magnetic field, while the induced voltage arising from the cut magnetic flux allows to detect the motion. The characteristics of the resonance have been studied from 10 mK to 30 K, in vacuum and in $^4$He gas. In this article, we focus on the results obtained above 1.5 K, in vacuum and gas, and introduce some features observed at lower temperatures. The resonant properties can be quantitatively understood by means of simple models, from the linear regime to a highly non-linear response at strong drives. We demonstrate that the non-linearity is mostly due to the geometry of the vibrators. We also show that in our device the friction mechanisms originate in the metallic layers, and can be fully characterized. The interaction with $^4$He gas is fit to theory without adjustable parameters., Long paper. Both experiment and theory
Published: 2008
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30. Electron and phonon Cooling in a Superconductor - Normal Metal - Superconductor Tunnel Junction

Author: Sukumar Rajauria, Pengshun Luo, Hervé Courtois, Bernard Pannetier, Thierry Fournier, Frank W. J. Hekking, Circuits électroniques quantiques Alpes (QuantECA), Institut Néel (NEEL), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS), Nanofab (Nanofab), Laboratoire de physique et modélisation des milieux condensés (LPM2C), Université Joseph Fourier - Grenoble 1 (UJF)-Centre National de la Recherche Scientifique (CNRS), Nano-Electronique Quantique et Spectroscopie (QuNES), and Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)
Subjects: Materials science, Phonon, FOS: Physical sciences, General Physics and Astronomy, 02 engineering and technology, Electron, 01 natural sciences, law.invention, [PHYS.QPHY]Physics [physics]/Quantum Physics [quant-ph], Tunnel junction, law, Condensed Matter::Superconductivity, Mesoscale and Nanoscale Physics (cond-mat.mes-hall), 0103 physical sciences, Interfacial thermal resistance, 010306 general physics, Quantum tunnelling, [PHYS.COND.CM-MSQHE]Physics [physics]/Condensed Matter [cond-mat]/Mesoscopic Systems and Quantum Hall Effect [cond-mat.mes-hall], Superconductivity, Condensed matter physics, Condensed Matter - Mesoscale and Nanoscale Physics, 021001 nanoscience & nanotechnology, Condensed Matter::Mesoscopic Systems and Quantum Hall Effect, 3. Good health, Heat transfer, Condensed Matter::Strongly Correlated Electrons, 0210 nano-technology, Electron cooling
Abstract: We present evidence for the cooling of normal metal phonons by electron tunneling in a Superconductor - Normal metal - Superconductor tunnel junction. The normal metal electron temperature is extracted by comparing the device current-voltage characteristics to the theoretical prediction. We use a quantitative model for the phonon cooling that includes the electron-phonon coupling in the normal metal and the Kapitza resistance between the substrate and the metal. It gives an excellent fit to the data and enables us to extract an effective phonon temperature in the normal metal., 4 pages, 5 figures
Published: 2006
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31. Hall effect in the pinned and sliding charge density wave state of NbSe3

Author: Thierry Crozes, Roman Chernikov, Serguei Brazovskii, Pierre Monceau, A. A. Ivanov, A. A. Sinchenko, Moscow Engineering-Physics Institute, Magnétisme et Supraconductivité (MagSup), Institut Néel (NEEL), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF), Nanofab (Nanofab), Laboratoire de Physique Théorique et Modèles Statistiques (LPTMS), Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11), Laboratoire international associé 'Physique des états électroniques cohérents en matière condensée (PEECMC) entre le CNRS et l'Académie des Sciences de Russie., and ANR-07-BLAN-0136,LoMaCoQuP,Local manipulation of collective quantum processes in correlated electronic states(2007)
Subjects: Condensed matter physics, Magnetoresistance, Chemistry, Thermal Hall effect, 02 engineering and technology, Conductivity, Atmospheric temperature range, Quantum Hall effect, Condensed Matter::Mesoscopic Systems and Quantum Hall Effect, 021001 nanoscience & nanotechnology, Condensed Matter Physics, 01 natural sciences, Hall effect, Condensed Matter::Superconductivity, Electric field, 0103 physical sciences, General Materials Science, [PHYS.COND.CM-SCE]Physics [physics]/Condensed Matter [cond-mat]/Strongly Correlated Electrons [cond-mat.str-el], 010306 general physics, 0210 nano-technology, Charge density wave
Abstract: International audience; Results of Hall effect measurements are reported both below and above the threshold electric field, E-t, for depinning the low temperature charge density wave (CDW) in NbSe3 in a wide temperature range. At low electric fields, below E-t, we have observed a change in the sign of the Hall voltage at all temperatures lower than T-p2. Comparison between the Hall effect and the magnetoresistance behavior indicates that the n-type conductivity in the low magnetic field range differs qualitatively from the p-type conductivity in the high field range. We demonstrate that at low temperature the CDW motion significantly alters the Hall voltage. These results indicate that, in NbSe3, the CDW in the sliding state interacts essentially with holes. Possible mechanisms of this effect are discussed.
Published: 2009
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32. Surface effect on the phonon transport of silicon nanowire

Author: Thierry Fournier, J. S. Heron, Olivier Bourgeois, Thermodynamique et biophysique des petits systèmes (TPS), Institut Néel (NEEL), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF), and Nanofab (Nanofab)
Subjects: History, Niobium nitride, Materials science, Silicon, Phonon, Nanowire, Physics::Optics, Silicon on insulator, chemistry.chemical_element, 02 engineering and technology, Surface finish, 01 natural sciences, Education, Condensed Matter::Materials Science, chemistry.chemical_compound, Thermal conductivity, 0103 physical sciences, Electronic engineering, 010306 general physics, ComputingMilieux_MISCELLANEOUS, [PHYS.COND.CM-MSQHE]Physics [physics]/Condensed Matter [cond-mat]/Mesoscopic Systems and Quantum Hall Effect [cond-mat.mes-hall], Condensed matter physics, Condensed Matter::Mesoscopic Systems and Quantum Hall Effect, 021001 nanoscience & nanotechnology, Computer Science Applications, chemistry, 0210 nano-technology, Order of magnitude
Abstract: Thermal conductance measurements are presented on nanostructured individual single crystalline Si suspended nanowires at low temperature. The mechanically suspended silicon nanowires with different sizes (130nm by 100nm and 130 nm by 200nm) are fabricated by e-beam lithography from Silicon On Insulator (SOI) substrate. The thermal conductance of the ballistic phonon wave guides is measured by means of an ac technique, the 3 ω method, using a niobium nitride transducer deposited on top. The geometry of the nanowire is chosen to match the order of magnitude of the dominant phonon wave length in silicon at low temperature which is of the order of 100 nm at 1K. A regular cubic law is observed at high temperature, but a deviation is measured at the lowest temperature with a saturation of thermal conductance which is attributed to the reduced geometry of the nanowire. The experimental results are in agreement with the Casimir theory taking into account the surface state (roughness) of the silicon wire. The deviation observed at low temperature is a clear signature of the consequence of the low dimentionality of the wire as well as the surface effects on the phonon transport.
Published: 2007
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32 results on '"Nanofab (Nanofab )"'

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32. Surface effect on the phonon transport of silicon nanowire

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