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41 results on '"Moussy, J. -B."'

1. Electrochemical Oxygen Intercalation into Sr$_2$IrO$_4$

Author

Fruchter, L., Brouet, V., Colson, D., Moussy, J. -B., Forget, A., and Li, Z. Z.

Subjects
Condensed Matter - Materials Science
Abstract

Oxygen was electrochemically intercalated into Sr$_2$IrO$_4$ sintered samples, single crystals and a thin film. We estimate the diffusion length to a few $\mu$m and the concentration of the intercalated oxygen to $\delta$ $\simeq$ 0.01. The latter is thus much smaller than for the cuprate and nickelate parent compounds, for which $\delta$ $>$ 0.1 is obtained, which could be a consequence of larger steric effects. The influence of the oxygen doping state on resistivity is small, indicating also a poor charge transfer to the conduction band. It is shown that electrochemical intercalation of oxygen may also contribute to doping, when gating thin films with ionic liquid in the presence of water.

Published
2017
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2. Room temperature spin filtering in epitaxial cobalt-ferrite tunnel barriers

Author

Ramos, A. V., Guittet, M. -J., Moussy, J. -B., Mattana, R., Deranlot, C., Petroff, F., and Gatel, C.

Subjects
Condensed Matter - Materials Science
Abstract

We report direct experimental evidence of room temperature spin filtering in magnetic tunnel junctions (MTJs) containing CoFe2O4 tunnel barriers via tunneling magnetoresistance (TMR) measurements. Pt(111)/CoFe2O4(111)/gamma-Al2O3(111)/Co(0001) fully epitaxial MTJs were grown in order to obtain a high quality system, capable of functioning at room temperature. Spin polarized transport measurements reveal significant TMR values of -18% at 2 K and -3% at 290 K. In addition, the TMR ratio follows a unique bias voltage dependence that has been theoretically predicted to be the signature of spin filtering in MTJs containing magnetic barriers. CoFe2O4 tunnel barriers therefore provide a model system to investigate spin filtering in a wide range of temperatures., Comment: 6 pages, 3 figures

Published
2007
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10. ARTIFICIAL MULTIFERROICS NANOSTRUCTURES BASED ON FERRITES / BATIO3 LOW DIMENSIONAL EPITAXIAL STRUCTURES

Author

Barbier, A., Nguyen, P.-L., Sarpi, B., Petronio, F., Rioult, M., Aghavnian, T., Moussy, J.-B., Stanescu, D., Magnan, H., Mocuta, C., Vlad, A., Resta, A., Ohresser, P., Maccherozzi, F., Rountree, C., Jedrecy, N., and Belkhou, R.

Abstract

ARTIFICIAL MULTIFERROICS NANOSTRUCTURES BASED ON FERRITES / BATIO3 LOW DIMENSIONAL EPITAXIAL STRUCTURES A. Barbier1,,, P.L. Nguyen1, B. Sarpi2, F. Petronio1,2, M. Rioult1,2, T. Aghavnian1,2, J.B. Moussy1, D. Stanescu1, H. Magnan1, C. Mocuta2, A. Vlad2, A. Resta2, P. Ohresser2, F.Maccherozzi4, C. Rountree1, N. Jedrecy3, R. Belkhou2 1 Service de Physique de lEtat Condens, SPEC, CEA, CNRS, UMR 3680, Universit ParisSaclay, CEA Saclay, 91191 GifsurYvette Cedex, France 2 Synchrotron SOLEIL, LOrme des Merisiers SaintAubin, 91192 GifsurYvette, France 3 INSP, UPMCSorbonne Universits, 75252 Paris Cedex 05, France 4 Diamond Light Source, Oxforshire, United Kingdom. Email: antoine.barbiercea.fr Multiferroic materials are of high technological interest because they are expected to lead to important applications and useful devices in important fields including spintronics, sensors, multiple state memory cells, energy harvesting etc. Intrinsic single phase multiferroic materials are seldom and new routes have to be explored. Associating, at the nanoscale, ferromagnetic and ferroelectric materials is a challenging route to obtain magnetoelectric multiferroics. We explored a number of possibilities resulting from the combination of single crystalline atomic oxygen assisted molecular beam epitaxy (AOMBE) grown thin films including prototypical ferroelectric BaTiO3 layers deposited on conductive substrates, typically Nb doped SrTiO3(001). We considered ferromagnetic elements doping, laminar MFe2O4/ BaTiO3 (MFe, Co, Ni, Mn) systems and more recently embedded nanostructures realized by combined AOMBE and laser lithography processes. These compounds/materials have reasonable electric polarization and are environment friendly. All systems were found with reasonable electric polarization. The indepth understanding of the nature of the couplings is challenging. To tackle these issue simultaneous structural, ferroelectric and magnetic measurements were necessary. We combined laboratory tools with state of the art synchrotron radiation, well suited techniques, including Xray diffraction, magnetic dichroism, and spectromicroscopy to describe the artificial multiferroic structures.

Published
2019
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11. Magnetotransport properties of Fe3O4 epitaxial thin films: Thickness effects driven by antiphase boundaries.

Author

Ramos, A. V., Moussy, J.-B., Guittet, M.-J., Bataille, A. M., Gautier-Soyer, M., Viret, M., Gatel, C., Bayle-Guillemaud, P., and Snoeck, E.

Subjects
*THIN films, *EPITAXY, *MOLECULAR beam epitaxy, *MAGNETORESISTANCE, *ELECTRON transport, *FERROUS oxide
Abstract

We present an in-depth study of the magnetotransport properties of epitaxial Fe3O4 films as a function of film thickness. The films, grown on α-Al2O3(0001) single crystals by atomic-oxygen assisted molecular beam epitaxy, exhibit high structural order and abrupt interfaces. These films contain antiphase boundaries (APBs), the density of which is strongly dependent on film thickness. A series of resistivity and magnetoresistance measurements demonstrate a systematic evolution of these properties with decreasing film thickness, revealing the impact of APBs on the transport properties in the films. We present a model based on the spin-polarized transport across an antiferromagnetically coupled APB in order to successfully reproduce our experimental data over a large range of applied magnetic fields. The comparison of this model with experimental results further clarifies the mechanism of the anomalous magnetotransport behavior in Fe3O4. [ABSTRACT FROM AUTHOR]

Published
2006
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13. Direct evidence of spin filtering across MnFe$_2$O$_4$ tunnel barrier by Meservey-Tedrow experiment

Author

Matzen, S., Moussy, J.-B., Miao, G. X., Moodera, J. S., Laboratoire de Chimie des Surfaces et Interfaces (LCSI), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Francis Bitter Magnet Laboratory, Massachusetts Institute of Technology, Francis Bitter Magnet Laboratory, Department of Physics [MIT Cambridge], and Massachusetts Institute of Technology (MIT)

Subjects
[PHYS]Physics [physics], Condensed Matter::Superconductivity, Condensed Matter::Strongly Correlated Electrons, PACS number(s): 75.47.Lx, 72.25.−b, 85.75.−d
Abstract

International audience; A spin filtering effect has been evidenced in epitaxial MnFe$_2$O$_4$ tunnel barriers directly by Meservey-Tedrow experiments. The asymmetry of the Zeeman-split tunneling conductance curves of the superconducting Al spin analyzer in Pt(111)/MnFe$_2$O$_4$(111)/$\gamma$-Al$_2$O$_3$(111)/Al tunnel junctions revealed a positive spin-polarization (up to + 9%), proving the potential of manganese ferrite for generation of a spin-polarized current. A negatively polarized spin filtering being expected theoretically, different mechanisms are discussed to explain both sign and amplitude of the measured spin-polarization.

Published
2013

14. Epitaxial growth and ferrimagnetic behavior of MnFe2O4(111) ultrathin layers for room-temperature spin filtering

Author

Matzen, S., Moussy, J. -B., Mattana, R., Bouzehouane, K., Deranlot, C., Petroff, F., Cezar, J. C., Arrio, M. -A., Sainctavit, Ph., Gatel, Christophe, Warot-Fonrose, Bénédicte, Zheng, Y., Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Unité mixte de physique CNRS/Thales (UMPhy CNRS/THALES), THALES-Centre National de la Recherche Scientifique (CNRS), Institut de minéralogie et de physique des milieux condensés (IMPMC), Université Pierre et Marie Curie - Paris 6 (UPMC)-IPG PARIS-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Centre d'élaboration de matériaux et d'études structurales (CEMES), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie de Toulouse (ICT-FR 2599), Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Institut de Chimie du CNRS (INC)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Institut de Chimie du CNRS (INC)-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA), Institut des Nanosciences de Paris (INSP), Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS), C'nano IdF [FILASPIN], RTRA-Triangle de la Physique [MicMMaC], THALES [France]-Centre National de la Recherche Scientifique (CNRS), Université Pierre et Marie Curie - Paris 6 (UPMC)-Université Paris Diderot - Paris 7 (UPD7)-Institut de Physique du Globe de Paris (IPG Paris)-Centre National de la Recherche Scientifique (CNRS), Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut de Chimie de Toulouse (ICT), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), and Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS)

Subjects
7547Lx, number(s): 7570−i, 8575−d, 7525−j, [PHYS.COND]Physics [physics]/Condensed Matter [cond-mat]
Abstract

International audience; We report on the epitaxial growth and physical properties of spinel MnFe2O4(111) thin films with thicknesses down to 2 nm. The thin films, grown on alpha-Al2O3(0001) single crystals or Pt(111) buffer layers by oxygen-assisted molecular beam epitaxy, exhibit high structural order with sharp interfaces and low roughness. The electrical and magnetic properties are carefully investigated and it is shown that MnFe2O4(111) ultrathin films keep an insulating and ferrimagnetic behavior at room temperature. Special attention is given to the iron/manganese valence state and the cationic ordering. X-ray absorption spectroscopy and magnetic circular dichroism measurements reveal that thin films contain mainly Fe3+ and Mn2+ cations, distributed predominantly in a normal spinel structure. This study proves the high potential of MnFe2O4 to be used as a magnetic tunnel barrier for spin filtering applications at room temperature.

Published
2011

17. Croissance par épitaxie par jets moléculaires d'hétérostructures à base d'oxydes de Fer et magnéto-transport

Author

Moussy, J. B., Gota, S., Guittet, M. J., Pham, L., Gautier-Soyer, M., Patrick Warin, Bayle-Guillemaud, P., Viret, M., Fermon, C., Ott, F., Bertrand Raquet, Michel Goiran, Laboratoire National des Champs Magnétiques Pulsés (LNCMP), Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), and Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)

Subjects
[PHYS.COND.CM-S]Physics [physics]/Condensed Matter [cond-mat]/Superconductivity [cond-mat.supr-con]
Published
2002

21. From ensemble average to single (nano-) objects properties by X-ray microdiffraction: a short review on structure determination (local strain, composition, ...) and objects manipulation (AFM-coupled)

Author

Mocuta, C., primary, Mundboth, K., additional, Stangl, J., additional, Krause, B., additional, Malachias, A., additional, Scheller, Th., additional, Cornelius, T., additional, Paniago, R., additional, Diaz, A., additional, Rodrigues, M., additional, Chevrier, J., additional, Dhez, O., additional, Metzger, T.H., additional, Bauer, G., additional, Barbier, A., additional, Ramos, A.V., additional, Guittet, M.-J., additional, Moussy, J.-B., additional, Stanescu, S., additional, Mattana, R., additional, Deranlot, C., additional, and Petroff, F., additional

Published
2010
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25. On the spin polarization at the interface probed by spin-resolved photoemission and spin-dependent tunneling

Author

Bataille, A.M., primary, Mattana, R., additional, Seneor, P., additional, Tagliaferri, A., additional, Gota, S., additional, Bouzehouane, K., additional, Deranlot, C., additional, Guittet, M.-J., additional, Moussy, J.-B., additional, de Nadaı¨, C., additional, Brookes, N.B., additional, Petroff, F., additional, and Gautier-Soyer, M., additional

Published
2007
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32. Thickness dependence of anomalous magnetic behavior in epitaxial Fe3O4(111) thin films: Effect of density of antiphase boundaries

Author

Moussy, J.-B., primary, Gota, S., additional, Bataille, A., additional, Guittet, M.-J., additional, Gautier-Soyer, M., additional, Delille, F., additional, Dieny, B., additional, Ott, F., additional, Doan, T., additional, Warin, P., additional, Bayle-Guillemaud, P., additional, Gatel, C., additional, and Snoeck, E., additional

Published
2004
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35. Structure, magnetic ordering, and spin filtering efficiency of NiFe2O4(111) ultrathin films.

Author

Matzen, S., Moussy, J. -B., Wei, P., Gatel, C., Cezar, J. C., Arrio, M. A., Sainctavit, Ph., and Moodera, J. S.

Subjects
*NICKEL ferrite, *MOLECULAR beam epitaxy, *ANTIPHASE boundaries, *SPIN polarization, *TUNNEL magnetoresistance measurement, *SPINTRONICS
Abstract

NiFe2O4(111) ultrathin films (3-5 nm) have been grown by oxygen-assisted molecular beam epitaxy and integrated as effective spin-filter barriers. Structural and magnetic characterizations have been performed in order to investigate the presence of defects that could limit the spin filtering efficiency. These analyses have revealed the full strain relaxation of the layers with a cationic order in agreement with the inverse spinel structure but also the presence of antiphase boundaries. A spin-polarization up to þ25% has been directly measured by the Meservey-Tedrow technique in Pt(111)/NiFe2O4(111)/γ-Al2O3(111)/Al tunnel junctions. The unexpected positive sign and relatively small value of the spin-polarization are discussed, in comparison with predictions and previous indirect tunnelling magnetoresistance measurements. [ABSTRACT FROM AUTHOR]

Published
2014
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36. Direct evidence of spin filtering across MnFe2O4 tunnel barrier by Meservey-Tedrow experiment.

Author

Matzen, S., Moussy, J.-B., Miao, G. X., and Moodera, J. S.

Subjects
*MANGANESE, *IRON, *SUPERCONDUCTORS, *SPIN polarization, *ASYMMETRY (Chemistry)
Abstract

A spin filtering effect has been evidenced in epitaxial MnFe2O4 tunnel barriers directly by Meservey-Tedrow experiments. The asymmetry of the Zeeman-split tunneling conductance curves of the superconducting Al spin analyzer in Pt(111)/MnFe2O4(111)/γ-Al203(111)/A1 tunnel junctions revealed a positive spin-polarization (up to + 9%), proving the potential of manganese ferrite for generation of a spin-polarized current. A negatively polarized spin filtering being expected theoretically, different mechanisms are discussed to explain both sign and amplitude of the measured spin-polarization. [ABSTRACT FROM AUTHOR]

Published
2013
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37. Epitaxial growth and ferrimagnetic behavior of MnFe2O4(111) ultrathin layers for room-temperature spin filtering.

Author

Matzen, S., Moussy, J.-B., Mattana, R., Bouzehouane, K., Deranlot, C., Petroff, F., Cezar, J. C., Arrio, M.-A., Sainctavit, Ph., Gatel, C., Warot-Fonrose, B., and Zheng, Y.

Subjects
*EPITAXY, *FERRIMAGNETISM, *MANGANESE spectra, *IRON spectra, *SPINEL, *X-ray spectroscopy, *MAGNETIC circular dichroism
Abstract

We report on the epitaxial growth and physical properties of spinel MnFe2O4(111) thin films with thicknesses down to 2 nm. The thin films, grown on α-Al2O3(0001) single crystals or Pt(111) buffer layers by oxygen-assisted molecular beam epitaxy, exhibit high structural order with sharp interfaces and low roughness. The electrical and magnetic properties are carefully investigated and it is shown that MnFe2O4(111) ultrathin films keep an insulating and ferrimagnetic behavior at room temperature. Special attention is given to the iron/manganese valence state and the cationic ordering. X-ray absorption spectroscopy and magnetic circular dichroism measurements reveal that thin films contain mainly Fe3+ and Mn2+ cations, distributed predominantly in a normal spinel structure. This study proves the high potential of MnFe2O4 to be used as a magnetic tunnel barrier for spin filtering applications at room temperature. [ABSTRACT FROM AUTHOR]

Published
2011
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40. Restoration of bulk magnetic properties by strain engineering in epitaxial CoFe2O4 (001) ultrathin films.

Author

Matzen, S., Moussy, J.-B., Mattana, R., Petroff, F., Gatel, C., Warot-Fonrose, B., Cezar, J. C., Barbier, A., Arrio, M.-A., and Sainctavit, Ph.

Subjects
*EPITAXY, *MAGNETIC properties of thin films, *SPINEL, *X-rays, *MAGNETIC circular dichroism, *TRANSMISSION electron microscopy, *ANISOTROPY
Abstract

We report on the significantly enhanced in-plane magnetic properties of CoFe2O4 (001) ultrathin layers (5 nm) grown on MgAl2O4 (001) in comparison to films deposited on MgO (001). The predicted inverse spinel structure is confirmed by x-ray magnetic circular dichroism measurements and transmission electronic microscopy studies reveal a significant in-plane compressive strain, responsible for the strong film anisotropy. These results show that strain engineering can be used to tailor the magnetic properties of oxide ultrathin films. A large compressive strain restores bulk magnetic properties for CoFe2O4 films at tunnel barrier thicknesses. [ABSTRACT FROM AUTHOR]

Published
2011
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41. Crystalline γ-Al2O3 barrier for magnetite-based magnetic tunnel junctions.

Author

Bataille, A. M., Moussy, J.-B., Paumier, F., Gota, S., Guittet, M.-J., Gautier-Soyer, M., Warin, P., Bayle-Guillemaud, P., Seneor, P., Bouzehouane, K., and Petroff, F.

Subjects
*MAGNETITE, *OXIDE minerals, *STOICHIOMETRY, *PHOTOELECTRON spectroscopy, *TRANSMISSION electron microscopy, *ATOMIC force microscopy
Abstract

We report on the elaboration and physical properties of fully epitaxial Fe3O4/Al2O3 bilayers to be included in magnetic tunnel junctions. Uncovered Fe3O4(111) single layers and bilayers were epitaxially grown onto sapphire (0001) substrates. Appropriate growth conditions lead to a stoichiometric Fe3O4 layer both at the Fe3O4/Al2O3 interface and on the whole thickness, as checked by in situ x-ray photoelectron spectroscopy and by the observation of the Verwey transition, respectively. Transmission electron microscopy demonstrates the epitaxial growth of a γ-Al2O3 layer on top of Fe3O4(111), which insulating properties have been monitored by conductive tip atomic force microscopy. [ABSTRACT FROM AUTHOR]

Published
2005
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