47 results on '"Tomohiko Niizeki"'
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2. Spin Hall magnetoresistance at the interface between platinum and cobalt ferrite thin films with large magnetic anisotropy
- Author
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Takeshi Tainosho, Tomohiko Niizeki, Jun-ichiro Inoue, Sonia Sharmin, Eiji Kita, and Hideto Yanagihara
- Subjects
Physics ,QC1-999 - Abstract
The recently discovered spin Hall magnetoresistance (SMR) effect is a useful means to obtain information on the magnetization process at the interface between a nonmagnetic metal and ferromagnetic insulators. We report the SMR measurements at the interface between platinum and cobalt ferrite thin films for samples with two different preferential directions of magnetization (out-of-plane and in-plane). The directional difference of the magnetic easy axis does not seem to influence the value of SMR.
- Published
- 2017
- Full Text
- View/download PDF
3. Observation of longitudinal spin-Seebeck effect in cobalt-ferrite epitaxial thin films
- Author
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Tomohiko Niizeki, Takashi Kikkawa, Ken-ichi Uchida, Mineto Oka, Kazuya Z. Suzuki, Hideto Yanagihara, Eiji Kita, and Eiji Saitoh
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Physics ,QC1-999 - Abstract
The longitudinal spin-Seebeck effect (LSSE) has been investigated in cobalt ferrite (CFO), an exceptionally hard magnetic spinel ferrite. A bilayer of a polycrystalline Pt and an epitaxially-strained CFO(110) exhibiting an in-plane uniaxial anisotropy was prepared by reactive rf sputtering technique. Thermally generated spin voltage in the CFO layer was measured via the inverse spin-Hall effect in the Pt layer. External-magnetic-field (H) dependence of the LSSE voltage (VLSSE) in the Pt/CFO(110) sample with H ∥ [001] was found to exhibit a hysteresis loop with a high squareness ratio and high coercivity, while that with H ∥ [ 1 1 ̄ 0 ] shows a nearly closed loop, reflecting the different anisotropies induced by the epitaxial strain. The magnitude of VLSSE has a linear relationship with the temperature difference (ΔT), giving the relatively large VLSSE /ΔT of about 3 μV/K for CFO(110) which was kept even at zero external field.
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- 2015
- Full Text
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4. Electron theory of perpendicular magnetic anisotropy of Co-ferrite thin films
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Jun-ichiro Inoue, Tomohiko Niizeki, Hideto Yanagihara, Hiroyoshi Itoh, and Eiji Kita
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Physics ,QC1-999 - Abstract
We develop an electron theory for the t2g electrons of Co2+ ions to clarify the perpendicular magnetic anisotropy (PMA) mechanism of Co-ferrite thin films by considering the spin-orbit interaction (SOI) and crystal-field (CF) potentials induced by the local symmetry around the Co ions and the global tetragonal symmetry of the film. Uniaxial and in-plane MA constants Ku and K1 at 0 K, respectively, are calculated for various values of SOI and CF. We show that reasonable parameter values explain the observed PMA and that the orbital moment for the in-plane magnetization reduces to nearly half of that of the out-of-plane magnetization.
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- 2014
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5. Electric readout of magnetic stripes in insulators
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Tomohiko Niizeki, Zhiyong Qiu, Yuki Shiomi, Maki Umeda, Eiji Saitoh, and Yao Chen
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Physics ,Superconductivity ,Multidisciplinary ,Condensed matter physics ,Magnetoresistance ,lcsh:R ,lcsh:Medicine ,02 engineering and technology ,021001 nanoscience & nanotechnology ,01 natural sciences ,Magnetic flux ,Article ,Magnetic field ,Vortex ,Superconducting properties and materials ,Magnetization ,Modulation ,Magnetic properties and materials ,Orientation (geometry) ,Condensed Matter::Superconductivity ,0103 physical sciences ,lcsh:Q ,010306 general physics ,0210 nano-technology ,lcsh:Science - Abstract
In superconductors, a topological configuration of the superconducting order parameter called a superconducting vortex carries magnetization. Such a magnetic topological object behaves like a minute particle generating a magnetic flux. Since the flux is localized with a nanometer scale, the vortex provides a nano-scale probe for local magnetic fields. Here we show that information of magnetic stripes in insulators can be read out by using vortices in an adjacent superconductor film as a probe. The orientation and width of magnetic micro stripes are both transcribed into resistance change of the superconductor through the modulation of vortex mobility affected by local magnetization. By changing the direction of external magnetic fields, zero-field resistance changes continuously according to the stripe orientation, and its modulation magnitude reaches up to 100%. The width of the stripes can also be estimated from the oscillatory magnetoresistance. Our results demonstrate a new possibility for non-volatile analog memory devices based on topological objects.
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- 2019
6. Magnon detection using a ferroic collinear multilayer spin valve
- Author
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Felix Fuhrmann, Vanessa Gall, Eiji Saitoh, Mathias Kläui, Zhiyong Qiu, Takashi Kikkawa, Rafael Ramos, Jairo Sinova, Dazhi Hou, Joel Cramer, Ulrike Ritzmann, Tomohiko Niizeki, and Ulrich Nowak
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Materials science ,Magnetoresistance ,530 Physics ,Science ,Spin valve ,General Physics and Astronomy ,02 engineering and technology ,01 natural sciences ,Article ,General Biochemistry, Genetics and Molecular Biology ,Magnetization ,Condensed Matter::Materials Science ,Spin wave ,0103 physical sciences ,ddc:530 ,010306 general physics ,lcsh:Science ,Spin-½ ,Multidisciplinary ,Condensed matter physics ,Spintronics ,Condensed Matter::Other ,Magnon ,General Chemistry ,021001 nanoscience & nanotechnology ,530 Physik ,Ferromagnetism ,Condensed Matter::Strongly Correlated Electrons ,lcsh:Q ,0210 nano-technology - Abstract
Information transport and processing by pure magnonic spin currents in insulators is a promising alternative to conventional charge-current-driven spintronic devices. The absence of Joule heating and reduced spin wave damping in insulating ferromagnets have been suggested for implementing efficient logic devices. After the successful demonstration of a majority gate based on the superposition of spin waves, further components are required to perform complex logic operations. Here, we report on magnetization orientation-dependent spin current detection signals in collinear magnetic multilayers inspired by the functionality of a conventional spin valve. In Y3Fe5O12|CoO|Co, we find that the detection amplitude of spin currents emitted by ferromagnetic resonance spin pumping depends on the relative alignment of the Y3Fe5O12 and Co magnetization. This yields a spin valve-like behavior with an amplitude change of 120% in our systems. We demonstrate the reliability of the effect and identify its origin by both temperature-dependent and power-dependent measurements., The Joule heating free magnon spintronics advances conventional electronics but demands more magnon-based logic operations. Here the authors achieved the magnon spin valve functionality in a YIG/CoO/Co structure where the amplitude of transmitted magnon from the YIG layer is dependent on the relative alignment of the YIG and Co magnetization.
- Published
- 2018
7. Antiferromagnetic NiO thickness dependent sign of the spin Hall magnetoresistance in γ-Fe2O3/NiO/Pt epitaxial stacks
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Bo-Wen Dong, Mathias Kläui, Joel Cramer, Christoph Schneider, Rafael Ramos, Eiji Saitoh, Andrew Ross, Lorenzo Baldrati, and Tomohiko Niizeki
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Materials science ,Physics and Astronomy (miscellaneous) ,Magnetoresistance ,Condensed matter physics ,Non-blocking I/O ,Perpendicular ,Yttrium iron garnet ,Antiferromagnetism ,Atmospheric temperature range ,Epitaxy ,Spin-½ - Abstract
We study the spin Hall magnetoresistance (SMR) in epitaxial γ–Fe2O3/NiO(001)/Pt stacks, as a function of temperature and thickness of the antiferromagnetic insulating NiO layer. Upon increasing the thickness of NiO from 0 nm to 10 nm, we detect a sign change of the SMR in the temperature range between 10 K and 280 K. This temperature dependence of the SMR in our stacks is different compared to that of previously studied yttrium iron garnet/NiO/Pt, as we do not find any peak or sign change as a function of temperature. We explain our data by a combination of spin current reflection from both the NiO/Pt and γ-Fe2O3/NiO interfaces and the thickness-dependent exchange coupling mode between the NiO and γ-Fe2O3 layers, comprising parallel alignment for thin NiO and perpendicular alignment for thick NiO.We study the spin Hall magnetoresistance (SMR) in epitaxial γ–Fe2O3/NiO(001)/Pt stacks, as a function of temperature and thickness of the antiferromagnetic insulating NiO layer. Upon increasing the thickness of NiO from 0 nm to 10 nm, we detect a sign change of the SMR in the temperature range between 10 K and 280 K. This temperature dependence of the SMR in our stacks is different compared to that of previously studied yttrium iron garnet/NiO/Pt, as we do not find any peak or sign change as a function of temperature. We explain our data by a combination of spin current reflection from both the NiO/Pt and γ-Fe2O3/NiO interfaces and the thickness-dependent exchange coupling mode between the NiO and γ-Fe2O3 layers, comprising parallel alignment for thin NiO and perpendicular alignment for thick NiO.
- Published
- 2019
8. Fabrication of yttrium-iron-garnet/Pt multilayers for the longitudinal spin Seebeck effect
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Tomohiko Niizeki, Hirohiko Murakami, Rafael Ramos, Tomoki Watamura, Takashi Kikkawa, Eiji Saitoh, and Tatsuhiro Nozue
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Condensed Matter - Materials Science ,Materials science ,Physics and Astronomy (miscellaneous) ,Condensed matter physics ,Yttrium iron garnet ,Gadolinium gallium garnet ,Materials Science (cond-mat.mtrl-sci) ,FOS: Physical sciences ,02 engineering and technology ,Sputter deposition ,021001 nanoscience & nanotechnology ,01 natural sciences ,chemistry.chemical_compound ,Magnetization ,chemistry ,Ferromagnetism ,Sputtering ,Seebeck coefficient ,0103 physical sciences ,Thermoelectric effect ,010306 general physics ,0210 nano-technology - Abstract
For longitudinal spin Seebeck effect (LSSE) devices, a multilayer structure comprising ferromagnetic and nonmagnetic layers is expected to improve their thermoelectric power. In this study, we developed the fabrication method for alternately stacked yttrium-iron-garnet (YIG)/Pt multilayer films on a gadolinium gallium garnet (GGG) (110) substrate, GGG/[YIG(49 nm)/Pt(4 nm)]$_n$ ($n =$ 1 - 5) based on room-temperature sputtering and $ex$-$situ$ post-annealing method and we evaluated their structural and LSSE properties. The fabricated [YIG/Pt]$_n$ samples show flat YIG/Pt interfaces and almost identical saturation magnetization $M_{\rm s}$, although they contain polycrystalline YIG layers on Pt layers as well as single-crystalline YIG layers on GGG. In the samples, we observed clear LSSE signals and found that the LSSE thermoelectric power factor (PF) increases monotonically with increasing $n$; the PF of the [YIG/Pt]$_5$ sample is enhanced by a factor of $\sim 28$ compared to that of [YIG/Pt]$_1$. This work may provide a guideline for developing future multilayerbased LSSE devices., 21 pages, 4 figures
- Published
- 2019
9. Interface-induced anomalous Nernst effect in Fe 3 O 4 /Pt-based heterostructures
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Takashi Kikkawa, Eiji Saitoh, Myriam H. Aguirre, Irene Lucas, M. R. Ibarra, Rafael Ramos, A. Anadón, Tomohiko Niizeki, Ken-ichi Uchida, Pedro A. Algarabel, L. Morellon, Agencia Estatal de Investigación (España), Japan Society for the Promotion of Science, Ministerio de Ciencia, Innovación y Universidades (España), Ministerio de Economía y Competitividad (España), European Commission, Universidad de Zaragoza, Comunidad de Madrid, Gobierno de Aragón, Ramos, R. [0000-0001-6840-3488], Kikkawa, T. [0000-0002-7789-604X], Uchida, K. [0000-0001-7680-3051], Algarabel, Pedro A. [0000-0002-4698-3378], Morellón, Luis [0000-0003-3724-508X], Aguirre, M. H. [0000-0002-1296-4793], Ramos, R., Kikkawa, T., Uchida, K., Algarabel, Pedro A., Morellón, Luis, and Aguirre, M. H.
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010302 applied physics ,Condensed Matter - Materials Science ,Materials science ,Physics and Astronomy (miscellaneous) ,Condensed matter physics ,Mathematics::General Topology ,Materials Science (cond-mat.mtrl-sci) ,FOS: Physical sciences ,Heterojunction ,02 engineering and technology ,021001 nanoscience & nanotechnology ,7. Clean energy ,01 natural sciences ,Magnetic field ,Transverse plane ,symbols.namesake ,Condensed Matter::Materials Science ,Electric field ,0103 physical sciences ,Thermoelectric effect ,symbols ,0210 nano-technology ,Spin-½ ,Voltage ,Nernst effect - Abstract
We have studied the anomalous Nernst effect (ANE) in [Fe3O4/Pt]-based heterostructures grown at high temperature, by measuring the ANE-induced electric field with a magnetic field applied normal to the sample surface, in the perpendicular magnetized configuration, where only the ANEs from the ferromagnetic layers or magnetic proximity effects can be detected. An ANE voltage is observed for [Fe3O4/Pt]n multilayers, and we further investigated its origin by performing measurements in [Fe3O4/Pt/Fe3O4] trilayers as a function of the Pt thickness. Our results suggest the presence of an interface-induced ANE in the metallic layer, possibly driven by a heat induced subnanometer interdiffusion which affects the nature of the Fe3O4/Pt interface. Despite this ANE, the spin Seebeck effect is the dominant mechanism for the transverse thermoelectric voltage in the in-plane magnetized configuration, accounting for about 70% of the voltage in the multilayers., This work was supported by the ERATO “Spin Quantum Rectification Project” (Grant No. JPMJER1402) and PRESTO “Phase Interfaces for Highly Efficient Energy Utilization” (Grant No. JPMJPR12C1) from JST, Japan; Grant-in-Aid for Scientific Research (A) (Grant No. JP15H02012), Grant-in-Aid for Scientific Research on Innovative Area, “Nano Spin Conversion Science” (Grant No. JP26103005) and Grant-in-Aid for Research Activity Start-up (No. JP18H05841) from JSPS KAKENHI, Japan; H2020-MSCA-RISE-2016 SPICOLOST (Grant No. 734187); and the Spanish Ministry of Economy and Competitiveness (Grant No. MAT2017-82970-C2, including FEDER) and the Aragon regional government (E26), Spain. The microscopy works were conducted in the LMA at INA, Universidad de Zaragoza. A.A. acknowledges MINECO [through Project Nos. FIS2016-78591-C3-1-R (SKYTRON), PCIN-2015-111 (SOgraph), and SEV-2016-0686] and Comunidad de Madrid through Grant No. S2018/NMT-4321 (NANOMAGCOST-CM).
- Published
- 2019
10. Antiferromagnetic NiO thickness dependent sign of the spin Hall magnetoresistance in γ-Fe 2 O 3 /NiO/Pt epitaxial stacks
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Joel Cramer, Bo Wen Dong, Tomohiko Niizeki, Eiji Saitoh, Lorenzo Baldrati, Andrew Ross, Rafael Ramos, Christoph Schneider, and Mathias Kläui
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010302 applied physics ,Materials science ,Physics and Astronomy (miscellaneous) ,Magnetoresistance ,Condensed matter physics ,Non-blocking I/O ,Yttrium iron garnet ,02 engineering and technology ,Atmospheric temperature range ,021001 nanoscience & nanotechnology ,Epitaxy ,01 natural sciences ,chemistry.chemical_compound ,Reflection (mathematics) ,chemistry ,0103 physical sciences ,Antiferromagnetism ,0210 nano-technology ,Spin (physics) - Abstract
We study the spin Hall magnetoresistance (SMR) in epitaxial γ–Fe2O3/NiO(001)/Pt stacks, as a function of temperature and thickness of the antiferromagnetic insulating NiO layer. Upon increasing the thickness of NiO from 0 nm to 10 nm, we detect a sign change of the SMR in the temperature range between 10 K and 280 K. This temperature dependence of the SMR in our stacks is different compared to that of previously studied yttrium iron garnet/NiO/Pt, as we do not find any peak or sign change as a function of temperature. We explain our data by a combination of spin current reflection from both the NiO/Pt and γ-Fe2O3/NiO interfaces and the thickness-dependent exchange coupling mode between the NiO and γ-Fe2O3 layers, comprising parallel alignment for thin NiO and perpendicular alignment for thick NiO.
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- 2019
- Full Text
- View/download PDF
11. Magnetic Properties of Spinel Ferrite Thin Films Grown by Reactive Sputtering
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Hideto Yanagihara, Eiji Kita, Sonia Sharmin, and Tomohiko Niizeki
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Materials science ,Mechanical Engineering ,02 engineering and technology ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,01 natural sciences ,Spinel ferrite ,Magnetic anisotropy ,Mechanics of Materials ,Sputtering ,0103 physical sciences ,General Materials Science ,Composite material ,Thin film ,010306 general physics ,0210 nano-technology - Published
- 2016
12. Magnetic Properties of Cobalt Ferrite (001) Films Grown on Spinel-Type Buffer Layers
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Hideto Yanagihara, Eiji Kita, Yuki Hisamatsu, and Tomohiko Niizeki
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Materials science ,Spinel ,Analytical chemistry ,Magnetostriction ,engineering.material ,Epitaxy ,Buffer (optical fiber) ,Electronic, Optical and Magnetic Materials ,Magnetic anisotropy ,Lattice constant ,Nuclear magnetic resonance ,Magnet ,engineering ,Ferrite (magnet) ,Electrical and Electronic Engineering - Abstract
Co x Fe 3−x O 4 (CFO) is a well-known spinel-type ferrite magnetic material showing large cubic magnetic anisotropy and magnetostriction[1]. Epitaxial films of CFO(001) grown on MgO(001) substrates exhibit extremely large perpendicular magnetic anisotropy (PMA) exceeding 10 Merg/cm3 owing to tensile stress originating from the lattice mismatch between the films and substrates[2]. Since the lattice constant of MgO is slightly larger than half that of the cobalt-ferrite, MgO(001) is a suitable substrate for growing CFO(001) with strong PMA. It is known that antiphase boundaries (APBs) exist at the interfaces in most of the spinel ferrite films grown on MgO(001). The high-density APBs contribute to the degradation of the magnetic properties of ferrite films such as the Fe 3 O 4 / MgO(001).[3] Therefore, it is crucial to develop a technique to reduce the number of APBs to utilize practically CFO films with large PMA. For this purpose, we attempted the insertion of spinel-type buffer layers and investigated how the insertion layers affect the magnetic properties of CFO films.
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- 2015
13. Spin transport in multilayer systems with fully epitaxial NiO thin films
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Rafael Ramos, Christoph Schneider, Lorenzo Baldrati, Andrew Ross, Mathias Kläui, Eiji Saitoh, Joel Cramer, and Tomohiko Niizeki
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Condensed Matter - Materials Science ,Materials science ,Condensed matter physics ,530 Physics ,Magnon ,Non-blocking I/O ,Inverse ,Materials Science (cond-mat.mtrl-sci) ,FOS: Physical sciences ,02 engineering and technology ,530 Physik ,021001 nanoscience & nanotechnology ,Epitaxy ,01 natural sciences ,Condensed Matter::Materials Science ,Ferrimagnetism ,0103 physical sciences ,Spin Hall effect ,Antiferromagnetism ,Condensed Matter::Strongly Correlated Electrons ,010306 general physics ,0210 nano-technology ,Spin-½ - Abstract
We report the generation and transport of thermal spin currents in fully epitaxial $\ensuremath{\gamma}\text{\ensuremath{-}}\mathrm{F}{\mathrm{e}}_{2}{\mathrm{O}}_{3}/\mathrm{NiO}(001)/\mathrm{Pt}$ and $\mathrm{F}{\mathrm{e}}_{3}{\mathrm{O}}_{4}/\mathrm{NiO}(001)/\mathrm{Pt}$ trilayers. A thermal gradient, perpendicular to the plane of the sample, generates a magnonic spin current in the ferrimagnetic maghemite $(\ensuremath{\gamma}\text{\ensuremath{-}}\mathrm{F}{\mathrm{e}}_{2}{\mathrm{O}}_{3})$ and magnetite $(\mathrm{F}{\mathrm{e}}_{3}{\mathrm{O}}_{4})$ thin films by means of the spin Seebeck effect. The spin current propagates across the epitaxial, antiferromagnetic insulating NiO layer, before being detected in the Pt layer by the inverse spin Hall effect. The transport of the spin signal is studied as a function of the NiO thickness, temperature, and ferrimagnetic material where the spin current is generated. In epitaxial NiO grown on maghemite, the spin Seebeck signal decays exponentially as a function of the NiO thickness, with a spin-diffusion length for thermally generated magnons of ${\ensuremath{\lambda}}_{\mathrm{MSDL}}=1.6\ifmmode\pm\else\textpm\fi{}0.2\phantom{\rule{0.16em}{0ex}}\mathrm{nm}$ (where MSDL is mean spin-diffusion length), largely independent of temperature. We see no enhancement of the spin-current signal as previously reported for certain temperatures and thicknesses of the NiO. In epitaxial NiO grown on magnetite, the temperature-averaged spin-diffusion length is ${\ensuremath{\lambda}}_{\mathrm{MSDL}}=3.8\ifmmode\pm\else\textpm\fi{}0.3\phantom{\rule{0.16em}{0ex}}\mathrm{nm}$, and we observe an enhancement of the spin signal when the NiO thickness is 0.8 nm, demonstrating that the growth conditions dramatically affect the spin-transport properties of the NiO even for full epitaxial growth. In contrast to theoretical predictions for coherent spin transport, we do not see vastly different spin-diffusion lengths between epitaxial and polycrystalline NiO layers.
- Published
- 2018
14. Spin-current coherence peak in superconductor/magnet junctions
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Takashi Kikkawa, Eiji Saitoh, J. Lustikova, Saburo Takahashi, Tomohiko Niizeki, Yuki Shiomi, and Maki Umeda
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Superconductivity ,Materials science ,Physics and Astronomy (miscellaneous) ,Condensed matter physics ,Condensed Matter - Mesoscale and Nanoscale Physics ,FOS: Physical sciences ,Insulator (electricity) ,02 engineering and technology ,021001 nanoscience & nanotechnology ,01 natural sciences ,Vortex ,symbols.namesake ,Ferrimagnetism ,Magnet ,Condensed Matter::Superconductivity ,Mesoscale and Nanoscale Physics (cond-mat.mes-hall) ,0103 physical sciences ,symbols ,Condensed Matter::Strongly Correlated Electrons ,010306 general physics ,0210 nano-technology ,Nernst effect ,Voltage ,Coherence (physics) - Abstract
Coherence peak effects in a superconductor induced by a thermal spin current are reported. We measured inverse spin Hall effects induced by spin injection from a ferrimagnetic insulator Y$_3$Fe$_5$O$_{12}$ into a superconductor NbN using longitudinal spin Seebeck effects. In the vicinity of the superconducting transition temperature of the NbN, a large enhancement of the spin Seebeck voltage is observed, whose sign is opposite to that for the vortex Nernst effect, but is consistent with a calculation for a coherence peak effect in the superconductor NbN., 5 pages, 4 figures
- Published
- 2018
15. In-Plane Uniaxial Anisotropy of Cobalt Ferrite Films Epitaxially Grown on MgAl2O4 (110)
- Author
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Hideto Yanagihara, Yuji Utsumi, Mineto Oka, Jun-ichiro Inoue, Eiji Kita, Kazuya Z. Suzuki, and Tomohiko Niizeki
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Magnetic anisotropy ,Materials science ,Anisotropy energy ,Magnetic moment ,Condensed matter physics ,Demagnetizing field ,Magnetostriction ,Substrate (electronics) ,Electrical and Electronic Engineering ,Epitaxy ,Anisotropy ,Electronic, Optical and Magnetic Materials - Abstract
We have investigated the magnetic properties of cobalt ferrite films epitaxially grown on MgAl 2 O 4 (110) substrates. The unit cell of the cobalt ferrite film on the substrate with twofold surface symmetry is tetragonally distorted with c/a
- Published
- 2014
16. Magnetic and Electrical Properties of Epitaxial NiFe2O4 (001) Films Fabricated by Reactive Sputtering
- Author
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Jumpei Morishita, Hideto Yanagihara, Kazuya Z. Suzuki, Eiji Kita, and Tomohiko Niizeki
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Materials science ,Condensed matter physics ,Spinel ,Substrate (electronics) ,engineering.material ,Epitaxy ,Electronic, Optical and Magnetic Materials ,Magnetization ,Lattice constant ,Sputtering ,Electrical resistivity and conductivity ,engineering ,Electrical and Electronic Engineering ,Thin film - Abstract
Thin films of NiFe 2 O 4 were fabricated on MgO (001) and MgAl 2 O 4 (MAO) (001) substrates by reactive radio frequency magnetron sputtering and were evaluated with regards to their electrical and magnetic properties. A saturation magnetization of 285 emu/cm 3 was obtained with a 30 nm thick film grown on an MAO substrate at an oxygen flow rate, Q, of 9 sccm. This enhanced magnetization was found to be due to a normal spinel arrangement at the interface. From the thickness dependence of the magnetization, the intrinsic magnetization was determined as 241 emu/cm 3 with the enhancement region estimated to be around 3/4 of the lattice constant, thus providing 8 μ B /f.u. The magnetization of those films grown on an MgO substrate exhibited remarkably smaller amplitudes to those of the MAO substrates. It is suggested that this substrate-dependent magnetization can be attributed to the number of antiphase boundaries. The resistivity was found to increase with Q, with a resistivity state in the same order as that of the bulk achieved with films prepared in which Q was greater than 10 sccm.
- Published
- 2014
17. Unexpected structural and magnetic depth dependence of YIG thin films
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Tomohiko Niizeki, B. J. Hickey, Eiji Saitoh, Ken-ichi Uchida, Artur Glavic, Mannan Ali, H. Ambaye, Christian J. Kinane, Joshaniel F. K. Cooper, and Sean Langridge
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Condensed Matter - Materials Science ,Materials science ,Condensed matter physics ,Magnetism ,Yttrium iron garnet ,Inverse ,chemistry.chemical_element ,Gadolinium gallium garnet ,Materials Science (cond-mat.mtrl-sci) ,FOS: Physical sciences ,02 engineering and technology ,Yttrium ,021001 nanoscience & nanotechnology ,01 natural sciences ,chemistry.chemical_compound ,Nuclear magnetic resonance ,chemistry ,0103 physical sciences ,Sensitivity (control systems) ,Neutron reflectometry ,Thin film ,010306 general physics ,0210 nano-technology - Abstract
We report measurements on yttrium iron garnet (YIG) thin films grown on both gadolinium gallium garnet (GGG) and yttrium aluminium garnet (YAG) substrates, with and without thin Pt top layers. We provide three principal results: the observation of an interfacial region at the Pt/YIG interface, we place a limit on the induced magnetism of the Pt layer and confirm the existence of an interfacial layer at the GGG/YIG interface. Polarised neutron reflectometry (PNR) was used to give depth dependence of both the structure and magnetism of these structures. We find that a thin film of YIG on GGG is best described by three distinct layers: an interfacial layer near the GGG, around 5 nm thick and non-magnetic, a magnetic bulk phase, and a non-magnetic and compositionally distinct thin layer near the surface. We theorise that the bottom layer, which is independent of the film thickness, is caused by Gd diffusion. The top layer is likely to be extremely important in inverse spin Hall effect measurements, and is most likely Y2O3 or very similar. Magnetic sensitivity in the PNR to any induced moment in the Pt is increased by the existence of the Y2O3 layer; any moment is found to be less than 0.02 uB/atom., 10 pages, 4 figures
- Published
- 2017
18. Spin Seebeck effect in insulating epitaxial γ−Fe2O3 thin films
- Author
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M. R. Ibarra, Eiji Saitoh, Rafael Ramos, Pilar Jiménez-Cavero, Luis Morellón, Tomohiko Niizeki, Irene Lucas, Ken-ichi Uchida, A. Anadón, Pedro A. Algarabel, Myriam H. Aguirre, Ministerio de Ciencia e Innovación (España), Gobierno de Aragón, European Commission, Ministerio de Economía y Competitividad (España), Ministerio de Educación, Cultura y Deporte (España), NEC Corporation, Japan Science and Technology Agency, Ministry of Education, Culture, Sports, Science and Technology (Japan), and Universidad de Zaragoza
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Materials science ,lcsh:Biotechnology ,Iron oxide ,Maghemite ,02 engineering and technology ,engineering.material ,01 natural sciences ,Crystal ,chemistry.chemical_compound ,Nuclear magnetic resonance ,Ferrimagnetism ,lcsh:TP248.13-248.65 ,0103 physical sciences ,Thermoelectric effect ,General Materials Science ,Thin film ,010306 general physics ,Magnetite ,Condensed matter physics ,Magnon ,General Engineering ,021001 nanoscience & nanotechnology ,lcsh:QC1-999 ,chemistry ,engineering ,0210 nano-technology ,lcsh:Physics - Abstract
We report the fabrication of high crystal quality epitaxial thin films of maghemite (γ−Fe2O3), a classic ferrimagnetic insulating iron oxide. Spin Seebeck effect (SSE) measurements in γ−Fe2O3/Pt bilayers as a function of sample preparation conditions and temperature yield a SSE coefficient of 0.5(1) µV/K at room temperature. Dependence on temperature allows us to estimate the magnon diffusion length in maghemite to be in the range of tens of nanometers, in good agreement with that of conducting iron oxide magnetite (Fe3O4), establishing the relevance of spin currents of magnonic origin in magnetic iron oxides., This work was supported by the Spanish Ministry of Science (through Project Nos. MAT2014- 51982-C2-R and C1-R, including FEDER funding) and the Aragon Regional government (Project ´ No. E26). Pilar Jimenez-Cavero acknowledges Spanish MECD for support through FPU program ´ (Reference No. FPU014/02546). The authors acknowledge the Advanced Microscopy LaboratoryINA University of Zaragoza for offering access to their instruments. This work was supported by PRESTO “Phase Interfaces for Highly Efficient Energy Utilization” and ERATO “Spin Quantum Rectification” from JST, Japan, Grant-in-Aid for Scientific Research (A) (No. 15H02012), Grant-inAid for Scientific Research on Innovative Area, “Nano Spin Conversion Science” (No. 26103005) from MEXT, Japan, NEC Corporation, and the Noguchi Institute.
- Published
- 2017
19. Full angular dependence of the spin Hall and ordinary magnetoresistance in epitaxial antiferromagnetic NiO(001)/Pt thin films
- Author
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Olena Gomonay, Jairo Sinova, Joel Cramer, Tomohiko Niizeki, M. Filianina, Armin Kleibert, Christoph Schneider, Rafael Ramos, Mathias Kläui, Tatiana Savchenko, Daniel Heinze, Andrew Ross, Eiji Saitoh, and Lorenzo Baldrati
- Subjects
Condensed Matter - Materials Science ,Materials science ,Condensed matter physics ,Magnetoresistance ,530 Physics ,Non-blocking I/O ,Materials Science (cond-mat.mtrl-sci) ,FOS: Physical sciences ,Magnetostriction ,Insulator (electricity) ,02 engineering and technology ,021001 nanoscience & nanotechnology ,Epitaxy ,530 Physik ,01 natural sciences ,Condensed Matter::Materials Science ,Amplitude ,0103 physical sciences ,Antiferromagnetism ,Condensed Matter::Strongly Correlated Electrons ,Thin film ,010306 general physics ,0210 nano-technology - Abstract
We report the observation of the three-dimensional angular dependence of the spin Hall magnetoresistance (SMR) in a bilayer of the epitaxial antiferromagnetic insulator NiO(001) and the heavy metal Pt, without any ferromagnetic element. The detected angular-dependent longitudinal and transverse magnetoresistances are measured by rotating the sample in magnetic fields up to 11 T, along three orthogonal planes (xy-, yz- and xz-rotation planes, where the z-axis is orthogonal to the sample plane). The total magnetoresistance has contributions arising from both the SMR and ordinary magnetoresistance. The onset of the SMR signal occurs between 1 and 3 T and no saturation is visible up to 11 T. The three-dimensional angular dependence of the SMR can be explained by a model considering the reversible field-induced redistribution of magnetostrictive antiferromagnetic S- and T-domains in the NiO(001), stemming from the competition between the Zeeman energy and the elastic clamping effect of the non-magnetic MgO substrate. From the observed SMR ratio, we estimate the spin mixing conductance at the NiO/Pt interface to be greater than $2\times10^{14}$ ${\Omega}^{-1}$ $m^{-2}$. Our results demonstrate the possibility to electrically detect the N\'eel vector direction in stable NiO(001) thin films, for rotations in the xy- and xz- planes. Moreover, we show that a careful subtraction of the ordinary magnetoresistance contribution is crucial to correctly estimate the amplitude of the SMR.
- Published
- 2017
- Full Text
- View/download PDF
20. Annealing Effects on Tunnel Magnetoresistance in Polyimide-Co Granular Films
- Author
-
Tomohiko Niizeki, Yuma Shibuya, Hideto Yanagihara, Eiji Kita, and Kazuya Z. Suzuki
- Subjects
Tunnel magnetoresistance ,Materials science ,Condensed matter physics ,Vacuum deposition ,Annealing (metallurgy) ,Electrical resistivity and conductivity ,Analytical chemistry ,Electrical and Electronic Engineering ,Thin film ,Granular material ,Grain size ,Electronic, Optical and Magnetic Materials ,Superparamagnetism - Abstract
Recently, we reported on the synthesis of a high-quality polyimide-Co (PI-Co) granular thin film using vapor deposition polymerization. This thin film had a tunnel magnetoresistance (TMR) ratio of 2.6% at room temperature. Because thermal annealing is considered effective for manipulating the grain size in granular systems composed of metallic ferromagnetic grains samples were annealed at temperatures between 473 K and 673 K in high vacuum. All samples were superparamagnetic at room temperature, and the average diameter of the Co particles, as deduced from Langevin analysis, increased significantly in the sample annealed at 623 K. The temperature dependence of the electrical resistance indicated tunneling conduction between Co particles in all samples. The TMR ratio increased to 4.8% at an annealing temperature of 473 K but decreased significantly after annealing above 623 K. This change was attributed to PI decomposition, as determined from the IR spectra.
- Published
- 2014
21. Effect of calculation conditions on the numerical simulation of magnetic materials with random magnetic anisotropy
- Author
-
S.-J. Lee, Suguru Sato, Eiji Kita, Hideto Yanagihara, Chiharu Mitsumata, and Tomohiko Niizeki
- Subjects
Physics ,Magnetization ,Magnetic anisotropy ,Condensed matter physics ,Exchange interaction ,General Physics and Astronomy ,Interaction energy ,Coercivity ,Single domain ,Anisotropy ,Grain size - Abstract
A numerical simulation of magnetic materials with random magnetic anisotropy was performed. The magnetization of an assembly of magnetically-interacting grains with randomly-oriented uniaxial anisotropy was calculated using the Landau-Lifshitz-Gilbert equation. For simplicity in the simulation, the magnetizations in a grain were assumed to be aligned in the same direction; this assumption is known as the single spin model. The interaction at the interface of the grains was taken into account by including an interaction energy between the unit vectors that represent the magnetization directions of the grains. Calculations were carried out for an N × N × N system, where the grain sizes D ranged from 5 to 40 nm and N ranged from 10 to 80. The relation between the coercive forces H C and the grain size is represented by H C ∼ D k . For the case of N = 10, k = 5.7, which corresponds to the primitive theory of the random anisotropy model (RAM) where k = 6. As N increased, k decreased slightly from 5.7 to 4.2. The gradient of the log-log plot of the coercive force versus the grain size (d logH C/d logD) was deduced by smoothing the data and was found to have a peak value of approximately 6. This result suggests that the RAM is supported by the simulation within the range of grain sizes where the peak was observed.
- Published
- 2013
22. Study of Perpendicular Magnetic Anisotropy and Magneto-Elastic Coupling in the First Principles and Phenomenology
- Author
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Ko Mibu, H. Yanagihara, Tomohiko Niizeki, J. Inoue, E. Kita, Masaaki Tanaka, and Hiroyoshi Itoh
- Subjects
Magnetization ,Magnetic anisotropy ,Materials science ,Condensed matter physics ,Ab initio quantum chemistry methods ,Perpendicular ,Coupling (piping) ,Electrical and Electronic Engineering ,Thin film ,Constant (mathematics) ,Order of magnitude ,Electronic, Optical and Magnetic Materials - Abstract
Considering the importance of magneto-elastic (ME) effects on the magnetic anisotropy (MA) of thin films, phenomenological analysis of the MA of Co ferrites on (001) and (111) substrates is conducted. It is found that thin films of Co ferrites on (111) substrates may produce oblique magnetization, while those on (001) substrates exhibit perpendicular MA. First-principles calculations for the ME constant of L10 ordered alloys, which show large uniaxial MA, are also performed, and it is determined that the value of the ME constant is on the same order of magnitude as that for the Co ferrites.
- Published
- 2013
23. Ferromagnetic Resonance in Magnetite Thin Films
- Author
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Masaki Nagata, Kenji Tanabe, Daichi Chiba, Eiji Kita, Tomohiko Niizeki, Takahiro Moriyama, Hideto Yanagihara, Jun-ichiro Ohe, Teruo Ono, and Makoto Myoka
- Subjects
Magnetization dynamics ,Materials science ,Magnetic domain ,Spin polarization ,Condensed matter physics ,Ferromagnetic resonance ,Electronic, Optical and Magnetic Materials ,Condensed Matter::Materials Science ,Magnetization ,Condensed Matter::Strongly Correlated Electrons ,Electrical and Electronic Engineering ,Saturation (magnetic) ,Orbital magnetization ,Spontaneous magnetization - Abstract
We have been investigating the spin motive force induced by magnetization dynamics in ferromagnetic materials. Ferrimagnetic materials are expected to exhibit even larger spin motive force due to their spatially staggered magnetic structure and high frequency spin wave modes. We believe that magnetite (Fe3O4) is one of the candidates for this purpose. Here, we report magnetic resonance in Fe3O4 thin films epitaxially grown on a MgO (001) substrate. The gyromagnetic ratio and the effective saturation magnetization are estimated to be 1.71 ×1011 s-1T-1 and 364 emu/cm3, respectively. The Gilbert damping constant of 0.02 is obtained from the magnetic field dependence of the linewidth. We expect to investigate the spin motive force induced from this magnetic resonance.
- Published
- 2014
24. Magnetization control for bit pattern formation of spinel ferromagnetic oxides by Kr ion implantation.
- Author
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Eiji Kita, Kazuya Z. Suzuki, Yang Liu, Yuji Utsumi, Jumpei Morishita, Daiki Oshima, Takeshi Kato, Tomohiko Niizeki, Ko Mibu, and Hideto Yanagihara
- Subjects
MAGNETIZATION ,IRRADIATION ,CHROMIUM ions ,FERROMAGNETISM ,MAGNETISM - Abstract
As a first step toward the development of bit-patterned magnetic media made of oxides, we investigated the effectiveness of magnetism control by Kr implantation in a typical spinel ferromagnetic oxide, Fe
3 O4 . We implanted Kr ions accelerated at 30 kV on 13-nm-thick Fe3 O4 thin films at dosages of (1-40)×1014 ions/cm2 . Magnetization decreased with increase in ion dosages and disappeared when irradiation was greater than 2×1015 ions/cm2 of Kr ions. These dosages are more than ten times smaller than that used in the N2 implantation for metallic and oxide ferromagnets. Both the temperature dependence of magnetization and the Mössbauer study suggest that the transition of Fe3 O4 from ferromagnetic to paramagnetic took place sharply due to Kr ion irradiation, which produces two-phase separation-ferromagnetic and nonmagnetic with insufficient dosage of Kr ions. [ABSTRACT FROM AUTHOR]- Published
- 2014
- Full Text
- View/download PDF
25. Spin Hall magnetoresistance at the interface between platinum and cobalt ferrite thin films with large magnetic anisotropy
- Author
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Jun-ichiro Inoue, Sonia Sharmin, Eiji Kita, Tomohiko Niizeki, Takeshi Tainosho, and Hideto Yanagihara
- Subjects
Materials science ,Condensed matter physics ,Magnetoresistance ,General Physics and Astronomy ,chemistry.chemical_element ,02 engineering and technology ,equipment and supplies ,021001 nanoscience & nanotechnology ,01 natural sciences ,lcsh:QC1-999 ,Condensed Matter::Materials Science ,Magnetization ,Magnetic anisotropy ,chemistry ,Ferromagnetism ,0103 physical sciences ,Spin Hall effect ,Condensed Matter::Strongly Correlated Electrons ,Thin film ,010306 general physics ,0210 nano-technology ,Spin (physics) ,Platinum ,human activities ,lcsh:Physics - Abstract
The recently discovered spin Hall magnetoresistance (SMR) effect is a useful means to obtain information on the magnetization process at the interface between a nonmagnetic metal and ferromagnetic insulators. We report the SMR measurements at the interface between platinum and cobalt ferrite thin films for samples with two different preferential directions of magnetization (out-of-plane and in-plane). The directional difference of the magnetic easy axis does not seem to influence the value of SMR.
- Published
- 2017
26. Magnon detection using a ferroic collinear multilayer spin valve.
- Author
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Cramer, Joel, Fuhrmann, Felix, Ritzmann, Ulrike, Gall, Vanessa, Tomohiko Niizeki, Rafael Ramos, Zhiyong Qiu, Dazhi Hou, Takashi Kikkawa, Sinova, Jairo, Nowak, Ulrich, Eiji Saitoh, and Kläui, Mathias
- Subjects
SPIN valves ,SPIN waves ,FERROMAGNETIC resonance ,MAGNONS ,SIGNAL detection ,LOGIC devices - Abstract
Information transport and processing by pure magnonic spin currents in insulators is a promising alternative to conventional charge-current-driven spintronic devices. The absence of Joule heating and reduced spin wave damping in insulating ferromagnets have been suggested for implementing efficient logic devices. After the successful demonstration of a majority gate based on the superposition of spin waves, further components are required to perform complex logic operations. Here, we report on magnetization orientation-dependent spin current detection signals in collinear magnetic multilayers inspired by the functionality of a conventional spin valve. In Y
3 Fe5 O12 |CoO|Co, we find that the detection amplitude of spin currents emitted by ferromagnetic resonance spin pumping depends on the relative alignment of the Y3 Fe5 O12 and Co magnetization. This yields a spin valve-like behavior with an amplitude change of 120% in our systems. We demonstrate the reliability of the effect and identify its origin by both temperature-dependent and power-dependent measurements. [ABSTRACT FROM AUTHOR]- Published
- 2018
- Full Text
- View/download PDF
27. Enhanced tunnel magnetoresistance in a spinel oxide barrier with cation-site disorder
- Author
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Tadakatsu Ohkubo, Hiroaki Sukegawa, Koichiro Inomata, Tomohiko Niizeki, Yoshio Miura, Seiji Mitani, Kazutaka Abe, Masafumi Shirai, Kazuhiro Hono, and Shingo Muramoto
- Subjects
Materials science ,Condensed matter physics ,Spinel ,Alloy ,Oxide ,chemistry.chemical_element ,Giant magnetoresistance ,engineering.material ,Condensed Matter Physics ,Oxygen ,Electronic, Optical and Magnetic Materials ,Tunnel magnetoresistance ,chemistry.chemical_compound ,chemistry ,Electrode ,engineering ,Quantum tunnelling - Abstract
We report enhanced tunnel magnetoresistance (TMR) ratios of 188$%$ (308$%$) at room temperature and 328$%$ (479$%$) at 15 K for cation-site-disordered MgAl${}_{2}$O${}_{4}$-barrier magnetic tunnel junctions (MTJs) with Fe (Fe${}_{0.5}$Co${}_{0.5}$ alloy) electrodes, which exceed the TMR ratios theoretically calculated and experimentally observed for ordered spinel barriers. The enhancement of TMR ratios is attributed to the suppression of the so-called band-folding effect in ordered spinel MTJs [Phys. Rev. B 86, 024426 (2012)]. First-principles calculations describe a dominant role of the oxygen sublattice for spin-dependent coherent tunneling, suggesting a mechanism of coherent tunneling occurring even in the disordered systems.
- Published
- 2012
28. Spin motive force induced in Fe3O4thin films with negative spin polarization
- Author
-
Takahiro Moriyama, Eiji Kita, Hideto Yanagihara, Kensho Tanaka, Teruo Ono, Masaki Nagata, Daichi Chiba, Kenji Tanabe, Jun-ichiro Ohe, Tomohiko Niizeki, and Yuki Hisamatsu
- Subjects
Condensed matter physics ,Spin polarization ,Chemistry ,Mathematics::History and Overview ,General Engineering ,Physics::Optics ,General Physics and Astronomy ,Ferromagnetic resonance ,Condensed Matter::Materials Science ,Spin Hall effect ,Condensed Matter::Strongly Correlated Electrons ,Thin film ,Sign (mathematics) ,Spin-½ - Abstract
Spin motive force (SMF) is induced by a time and spatial derivative of magnetizations and is dependent on spin polarization. We compare the SMF in FeNi with positive spin polarization with that in a magnetite (Fe3O4) with negative spin polarization. We observe the SMF induced by a nonuniform ferromagnetic resonance in Fe3O4 and find that the SMF in Fe3O4 is opposite to that in FeNi. This result originates from the negative spin polarization of Fe3O4. Our clear observation of the SMF depending on the sign of the spin polarization agrees well with the framework of the SMF theory.
- Published
- 2015
29. Enhanced tunnel magnetoresistance due to spin dependent quantum well resonance in specific symmetry states of an ultrathin ferromagnetic electrode
- Author
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Tomohiko Niizeki, Koichiro Inomata, and Nobuki Tezuka
- Subjects
Materials science ,Spintronics ,Condensed matter physics ,Ab initio ,General Physics and Astronomy ,Resonance ,Biasing ,Condensed Matter::Mesoscopic Systems and Quantum Hall Effect ,Condensed Matter::Materials Science ,Tunnel magnetoresistance ,Ferromagnetism ,Condensed Matter::Superconductivity ,Spin (physics) ,Quantum well - Abstract
Spin dependent quantum well resonance has been investigated in fully epitaxial magnetic tunnel junctions with Fe(001)/MgO(001)/ultrathin Fe(001)/Cr(001) structure. The dI/dV spectra clearly show the resonant peaks which shift systematically depending on the thickness of an ultrathin electrode as predicted in ab initio calculation [Zhong-Yi Lu et al, Phys. Rev. Lett. 94, 207210 (2005)]. The magnetotransport is strongly modulated at the same bias voltage as the resonant peaks. This control of the magnetotransport in magnetic tunnel junctions at a specific bias voltage will contribute to the development of active spintronic devices.
- Published
- 2007
30. Observation of longitudinal spin-Seebeck effect in cobalt-ferrite epitaxial thin films
- Author
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Hideto Yanagihara, Mineto Oka, Eiji Saitoh, Ken-ichi Uchida, Tomohiko Niizeki, Takashi Kikkawa, Kazuya Z. Suzuki, and Eiji Kita
- Subjects
Hysteresis ,Magnetic anisotropy ,Materials science ,Condensed matter physics ,Hall effect ,Thermoelectric effect ,Spin Hall effect ,General Physics and Astronomy ,Ferrite (magnet) ,Coercivity ,Magnetic hysteresis ,lcsh:Physics ,lcsh:QC1-999 - Abstract
The longitudinal spin-Seebeck effect (LSSE) has been investigated in cobalt ferrite (CFO), an exceptionally hard magnetic spinel ferrite. A bilayer of a polycrystalline Pt and an epitaxially-strained CFO(110) exhibiting an in-plane uniaxial anisotropy was prepared by reactive rf sputtering technique. Thermally generated spin voltage in the CFO layer was measured via the inverse spin-Hall effect in the Pt layer. External-magnetic-field (H) dependence of the LSSE voltage (VLSSE) in the Pt/CFO(110) sample with H ∥ [001] was found to exhibit a hysteresis loop with a high squareness ratio and high coercivity, while that with H ∥ [ 1 1 ̄ 0 ] shows a nearly closed loop, reflecting the different anisotropies induced by the epitaxial strain. The magnitude of VLSSE has a linear relationship with the temperature difference (ΔT), giving the relatively large VLSSE /ΔT of about 3 μV/K for CFO(110) which was kept even at zero external field.
- Published
- 2015
31. Perpendicular magnetic anisotropy in epitaxially strained cobalt-ferrite (001) thin films
- Author
-
Jun-ichiro Inoue, Yuji Utsumi, Eiji Kita, Tomohiko Niizeki, and Hideto Yanagihara
- Subjects
Diffraction ,Magnetization ,Materials science ,Condensed matter physics ,Electron diffraction ,Sputtering ,General Physics and Astronomy ,Thin film ,Sputter deposition ,Epitaxy ,Anisotropy - Abstract
We investigated the dependencies of both the magnetization characteristics and the perpendicular magnetic anisotropy of Co x Fe3– x O4(001) epitaxial films (x = 0.5 and 0.75) on the growth conditions of the reactive magnetron sputtering process. Both saturation magnetization and the magnetic uniaxial anisotropy constant Ku are strongly dependent on the reactive gas (O2) flow rate, although there is little difference in the surface structures for all samples observed by reflection high-energy electron diffraction. In addition, certain dead-layer-like regions were observed in the initial stage of the film growth for all films. Our results suggest that the magnetic properties of Co x Fe3– x O4 epitaxial films are governed by the oxidation state and the film structure at the vicinity of the interface.
- Published
- 2014
32. Corrigendum: Selective growth of Fe3O4 and γ-Fe2O3 films with reactive magnetron sputtering (2013 J. Phys. D: Appl. Phys. 46 175004)
- Author
-
D. Isaka, M. Myoka, Ko Mibu, Hideto Yanagihara, Eiji Kita, and Tomohiko Niizeki
- Subjects
Reactive magnetron ,Materials science ,Acoustics and Ultrasonics ,Sputtering ,Analytical chemistry ,Condensed Matter Physics ,Surfaces, Coatings and Films ,Electronic, Optical and Magnetic Materials - Published
- 2014
33. Erratum: 'Extraordinarily large perpendicular magnetic anisotropy in epitaxially strained cobalt-ferrite CoxFe3−xO4(001) (x = 0.75, 1.0) thin films' [Appl. Phys. Lett. 103, 162407 (2013)]
- Author
-
Ryohei Aoyama, Kazuyuki Koike, Hironori Nakao, Eiji Kita, Yuichi Yamasaki, Yuji Utsumi, Jun-ichiro Inoue, Tomohiko Niizeki, and Hideto Yanagihara
- Subjects
Materials science ,Physics and Astronomy (miscellaneous) ,Condensed matter physics ,Perpendicular magnetic anisotropy ,Cobalt ferrite ,Cobalt compounds ,Thin film ,Epitaxy - Published
- 2014
34. Control of magnetization in spinel-type Fe3O4 thin films by N2 ion implantation
- Author
-
Ko Mibu, Noboru Yamaguchi, Yuji Utsumi, Hideto Yanagihara, Tomohiko Niizeki, Eiji Kita, Kazunaga Ono, Jumpei Morishita, Makoto Iura, Tsutomu Nishihashi, and Kazuya Z. Suzuki
- Subjects
Materials science ,Spinel ,General Engineering ,Analytical chemistry ,Oxide ,General Physics and Astronomy ,engineering.material ,equipment and supplies ,Ion ,Magnetization ,chemistry.chemical_compound ,Ion implantation ,Nuclear magnetic resonance ,Ferromagnetism ,chemistry ,engineering ,Irradiation ,Thin film ,human activities - Abstract
The magnetism of a typical spinel ferromagnetic oxide, Fe3O4, was controlled via ion implantation. Nitrogen ions were accelerated at 6–10 kV and irradiated to the 13-nm-thick Fe3O4 thin films with dosages of 2 × 1016 to 6 × 1016 ions/cm2. The magnetization decreased with the increase in ion dosage, and there was almost no magnetization when 6 × 1016 ions/cm2 of nitrogen was irradiated, irrespective of the acceleration voltages. The results of the temperature dependence of the magnetization and the Mössbauer study suggest that the transition from ferromagnetic to nonmagnetic phases in the Fe3O4 thin film upon N2 ion irradiation proceeds abruptly without the formation of intermediate states.
- Published
- 2014
35. Magnetization Control for Bit Pattern Formation of Spinel Ferromagnetic Oxides by Kr Ion Implantation
- Author
-
Hideto Yanagihara, Tomohiko Niizeki, Takeshi Kato, Yuji Utsumi, Yang Liu, Jumpei Morishita, Ko Mibu, Kazuya Suzuki, Eiji Kita, and Daiki Oshima
- Subjects
Materials science ,Condensed matter physics ,Spinel ,Oxide ,General Physics and Astronomy ,engineering.material ,Ion ,Magnetization ,Paramagnetism ,chemistry.chemical_compound ,Ion implantation ,Ferromagnetism ,chemistry ,engineering ,Irradiation - Abstract
As a first step toward the development of bit-patterned magnetic media made of oxides, we investigated the effectiveness of magnetism control by Kr implantation in a typical spinel ferromagnetic oxide, Fe3O4. We implanted Kr ions accelerated at 30 kV on 13-nm-thick Fe3O4 thin films at dosages of (1–40) × 1014 ions/cm2. Magnetization decreased with increase in ion dosages and disappeared when irradiation was greater than 2 × 1015 ions/cm2 of Kr ions. These dosages are more than ten times smaller than that used in the N2 implantation for metallic and oxide ferromagnets. Both the temperature dependence of magnetization and the Mossbauer study suggest that the transition of Fe3O4 from ferromagnetic to paramagnetic took place sharply due to Kr ion irradiation, which produces two-phase separation—ferromagnetic and nonmagnetic with insufficient dosage of Kr ions.
- Published
- 2014
36. Large perpendicular magnetic anisotropy at Fe/MgO interface
- Author
-
Tadakatsu Ohkubo, Takayoshi Sasaki, Tomohiko Niizeki, S. Mitani, Kazuhiro Hono, Hiroaki Sukegawa, Zhenchao Wen, Jungwoo Koo, and K. Inomata
- Subjects
Magnetization ,Magnetic anisotropy ,Materials science ,Nuclear magnetic resonance ,Physics and Astronomy (miscellaneous) ,Condensed matter physics ,Perpendicular magnetic anisotropy ,Thermal stability ,Layer (electronics) ,Deposition (law) ,Surface reconstruction ,Surface states - Abstract
A large perpendicular magnetic anisotropy (PMA) of 1.4 MJ/m3 was observed from ultrathin Fe/MgO(001) bilayers grown on Cr-buffered MgO(001). The PMA strongly depends on the surface state of Fe prior to the MgO deposition. A large PMA energy density of 1.4 MJ/m3 was achieved for a 0.7 nm thick Fe layer having adsorbate-induced surface reconstruction, which is likely to originate from oxygen atoms floating up from the Cr buffer layer. This large magnitude of PMA satisfies the criterion that is required for thermal stability of magnetization in a few tens nanometer-sized magnetic memory elements.
- Published
- 2013
37. Extraordinarily large perpendicular magnetic anisotropy in epitaxially strained cobalt-ferrite CoxFe3−xO4(001) (x = 0.75, 1.0) thin films
- Author
-
Hideto Yanagihara, Eiji Kita, Ryohei Aoyama, Kazuyuki Koike, Hironori Nakao, Jun-ichiro Inoue, Yuichi Yamasaki, Tomohiko Niizeki, and Yuji Utsumi
- Subjects
Magnetization ,Magnetic anisotropy ,Materials science ,Nuclear magnetic resonance ,Physics and Astronomy (miscellaneous) ,Condensed matter physics ,Sputtering ,X-ray crystallography ,Sputter deposition ,Thin film ,Anisotropy ,Saturation (magnetic) - Abstract
Perpendicular magnetic anisotropy (PMA) of cobalt-ferrite CoxFe3-xO4 (x = 0.75 and 1.0) epitaxial thin films grown on MgO (001) by a reactive magnetron sputtering technique was investigated. The saturation magnetization was found to be 430 emu/cm3 for x = 0.75, which is comparable to that of bulk CoFe2O4 (425 emu/cm3). Torque measurements afforded PMA constants of Kueff=9.0 Merg/cm3 (Ku=10.0 Merg/cm3) and Kueff=9.7 Merg/cm3 for x = 0.75 and 1.0, respectively. The value of Kueff extrapolated using Miyajima's plot was as high as 14.7 Merg/cm3 for x = 1.0. The in-plane four-fold magnetic anisotropy was evaluated to be 1.6 Merg/cm3 for x = 0.75. X-ray diffraction measurement revealed our films to be pseudomorphically strained on MgO (001) with a Poisson ratio of 0.4, leading to a considerable in-plane tensile strain by which the extraordinarily large PMA could be accounted for.
- Published
- 2013
38. Magnetotransport properties in epitaxial Fe3O4(001) thin films with current perpendicular to the plane geometry
- Author
-
Jun-ichiro Inoue, Hideto Yanagihara, Eiji Kita, K. Shimada, Shinji Yuasa, Akio Fukushima, and Tomohiko Niizeki
- Subjects
Materials science ,Magnetoresistance ,Condensed matter physics ,chemistry ,Perpendicular ,General Physics and Astronomy ,chemistry.chemical_element ,Metal–insulator transition ,Thin film ,Thermal conduction ,Epitaxy ,Tin ,Magnetic field - Abstract
We investigated the fundamental transport properties of epitaxial magnetite (Fe3O4) films with applied current perpendicular to the plane geometry. The devices with a junction area of 36 μm2 were fabricated with TiN/Fe3O4/ TM (TM: Ti and Fe) stacking. Both the temperature dependence and the magnetic field dependence of the junction resistance were measured. Most of the resistance properties were independent of whether the electrode was magnetic (Fe) or nonmagnetic (Ti). Below the Verwey point, the junction resistance abruptly increased with decreasing temperature, and the resistance reached maximum at approximately 30 K. The magnetoresistance showed a peak of ∼27% at T≈55 K. The observed resistance behavior was consistent with a hopping conduction mechanism with a Coulomb interaction.
- Published
- 2013
39. Selective growth of Fe3O4andγ-Fe2O3films with reactive magnetron sputtering
- Author
-
Ko Mibu, M. Myoka, Eiji Kita, D. Isaka, Tomohiko Niizeki, and Hideto Yanagihara
- Subjects
Materials science ,Acoustics and Ultrasonics ,Analytical chemistry ,Oxide ,Condensed Matter Physics ,Epitaxy ,Surfaces, Coatings and Films ,Electronic, Optical and Magnetic Materials ,Volumetric flow rate ,Metal ,chemistry.chemical_compound ,Magnetization ,Carbon film ,chemistry ,Sputtering ,Electrical resistivity and conductivity ,visual_art ,visual_art.visual_art_medium - Abstract
A selective method for growing high-quality spinel-type epitaxial Fe3O4(0 0 1) or γ-Fe2O3(0 0 1) films was developed using conventional planar-type sputtering by controlling the flow rate of oxygen gas . Although magnetization of the oxide films is close to that of Fe3O4 or γ-Fe2O3 for all , the room-temperature resistivity and the Fe3+ and Fe2.5+ composition ratios of the films are dependent on . The films for and are identified as Fe3O4 and γ-Fe2O3 films, respectively. All the results suggest that Fe3O4 films are obtained only when sputtered in the metal mode, and γ-Fe2O3 films are obtained in the oxide mode.
- Published
- 2013
40. Room temperature magnetoresistance in a polyimide-Co granular film synthesized by vapor deposition polymerization
- Author
-
Kazuya Z. Suzuki, Tomohiko Niizeki, Ken Kojio, Hideto Yanagihara, and Eiji Kita
- Subjects
Materials science ,Physics and Astronomy (miscellaneous) ,Spintronics ,Magnetoresistance ,chemistry.chemical_element ,Thermal conduction ,Polymerization ,chemistry ,Chemical engineering ,Electrical resistivity and conductivity ,Polymer chemistry ,Thin film ,Cobalt ,Polyimide - Abstract
Magnetic and magnetotransport properties of pyromellitic dianhydride-4,4′-oxydianiline polyimide-Co granular thin films prepared by vapor deposition polymerization are investigated. The prepared sample is composed of Co particles with diameters of 2–3 nm homogeneously dispersed in a denatured polyimide matrix. The temperature dependence of the resistivity closely follows the T−1/2 law, suggesting that the dominant conduction mechanism is tunneling between metallic granules embedded in the insulating polyimide matrix. The magnetoresistances at 300 and 90 K are 2.6% and 3.0%, respectively. The results indicate that polyimide is a promising material for organic spintronics.
- Published
- 2012
41. Correlation between symmetry-selective transport and spin-dependent resonant tunneling in fully epitaxial Cr/ultrathin-Fe/MgO/Fe(001) magnetic tunnel junctions
- Author
-
Nobuki Tezuka, Seiji Mitani, Tomohiko Niizeki, Hiroaki Sukegawa, and Koichiro Inomata
- Subjects
Materials science ,Physics and Astronomy (miscellaneous) ,Magnetoresistance ,Condensed matter physics ,Annealing (metallurgy) ,Conductance ,chemistry.chemical_element ,Condensed Matter::Mesoscopic Systems and Quantum Hall Effect ,Epitaxy ,Amorphous solid ,Condensed Matter::Materials Science ,Chromium ,chemistry ,Condensed Matter::Superconductivity ,Quantum well ,Quantum tunnelling - Abstract
Spin-dependent resonant tunneling was investigated in fully epitaxial Cr(001)/ultrathin Fe(001)/MgO(001)/Fe(001) pseudo double-barrier magnetic tunnel junctions (MTJs) by varying structural coherence of the MgO barrier through postdeposition annealing and Mg layer insertion. It was clearly demonstrated that not only the flatness of the Fe quantum-well layer, but also the structural coherence of the MgO barrier caused the appearance of sharp resonant conductance peaks which were not obtained for spin-dependent resonant tunneling in amorphous AlO-barrier MTJs. The symmetry-selective transport via MgO barrier plays a crucial role for the resonant tunneling as well as large tunneling magnetoresistance.
- Published
- 2011
42. Publisher’s Note: 'Fully epitaxial Fe/MgO/Fe(001) junctions with nonmagnetic metal layer insertion' [J. Appl. Phys. 109, 07C726 (2011)]
- Author
-
Tomohiko Niizeki, Seiji Mitani, K. Inomata, Shinya Kasai, and Hiroaki Sukegawa
- Subjects
Metal ,Materials science ,Condensed matter physics ,visual_art ,Inorganic chemistry ,visual_art.visual_art_medium ,General Physics and Astronomy ,Epitaxy ,Layer (electronics) - Published
- 2011
43. Fully epitaxial Fe/MgO/Fe(001) junctions with nonmagnetic metal layer insertion
- Author
-
K. Inomata, Shinya Kasai, Seiji Mitani, Hiroaki Sukegawa, and Tomohiko Niizeki
- Subjects
Tunnel effect ,Materials science ,Condensed matter physics ,Magnetoresistance ,Sputtering ,General Physics and Astronomy ,Giant magnetoresistance ,Sputter deposition ,Atmospheric temperature range ,Epitaxy ,Molecular beam epitaxy - Abstract
Fully epitaxial Fe/Ag-wedge/MgO/Fe(001) magnetic tunnel junctions (MTJs) were prepared by using a combination of magnetron sputtering and molecular beam epitaxy, and their magneto-transport properties were investigated for the Ag thickness range of 0–9 monolayer (ML). The large tunneling magnetoresistance (TMR) ratios of up to 160% at room temperature were obtained in the Fe/MgO/Fe region (Ag: 0 ML) after the optimization of the preparation conditions. The finite TMR ratio was observed until the Ag thickness reached 4 ML, although no significant oscillation due to quantum well states (QWS) was seen. This is the first demonstration of TMR in the fully epitaxial MTJs with nonmagnetic metal layer insertion which can potentially create spin-dependent QWS.
- Published
- 2011
44. Structural instability of FeCo ultrathin films grown on MgO(100)
- Author
-
Tomohiko Niizeki and Seiji Mitani
- Subjects
History ,Tunnel magnetoresistance ,Crystallography ,Materials science ,Condensed matter physics ,Atomic force microscopy ,Annealing (metallurgy) ,Fe based ,Instability ,Computer Science Applications ,Education ,Lattice mismatch - Abstract
Structures and their stability of FeCo ultrathin films grown on MgO(100) were investigated. Atomic force microscopy observations revealed dramatic structural changes from a continuous ultrathin layer to coarse islands by low temperature annealing. The results suggest that the thin layered structures of Fe based alloys as grown on MgO(100) are not so stable as expected from the relatively small lattice mismatch between Fe based alloys and MgO. This possibly explains annealing temperature dependence of tunnel magnetoresistance observed in a Fe/MgO/Fe(100) junction.
- Published
- 2011
45. Tunnel magnetoresistance with improved bias voltage dependence in lattice-matched Fe/spinel MgAl2O4/Fe(001) junctions
- Author
-
Kazuhiro Hono, Tadakatsu Ohkubo, Koichiro Inomata, Seiji Mitani, Hiroaki Sukegawa, Takao Furubayashi, Tomohiko Niizeki, Shinya Kasai, Wenhong Wang, and Huixin Xiu
- Subjects
Tunnel magnetoresistance ,Materials science ,Physics and Astronomy (miscellaneous) ,Condensed matter physics ,Bilayer ,Lattice (order) ,Spinel ,engineering ,Biasing ,Plasma ,Dislocation ,engineering.material ,Epitaxy - Abstract
We fabricated fully epitaxial Fe/MgAl2O4/Fe(001) magnetic tunnel junctions using plasma oxidation of an Mg/Al bilayer. The MgAl2O4 showed a (001)-oriented spinel-type structure, and there were few misfit dislocations at the interfaces between the MgAl2O4 and the two Fe layers due to a small lattice mismatch (∼1%). Tunnel magnetoresistance (TMR) ratios up to 117% (165%) were obtained at room temperature (15 K). The bias voltage for one-half of the zero-bias TMR ratio (Vhalf) was relatively large, ranging from 1.0 to 1.3 V at room temperature, which is attributed to the small misfit dislocation density.
- Published
- 2010
46. Giant tunneling magnetoresistance with electron beam evaporated MgO barrier and CoFeB electrodes
- Author
-
Huseyin Kurt, J. M. D. Coey, Tomohiko Niizeki, and Kaan Oguz
- Subjects
Nuclear magnetic resonance ,Materials science ,Magnetoresistance ,Condensed matter physics ,Annealing (metallurgy) ,Electrode ,Cathode ray ,General Physics and Astronomy ,Giant magnetoresistance ,Sputter deposition ,Quantum tunnelling ,Amorphous solid - Abstract
Electron-beam (EB) evaporated MgO grows with (001) texture on amorphous CoFeB when the deposition rate is kept below 5 pm/s. Magnetic tunnel junctions (MTJs) fabricated using this method exhibit ∼240% magnetoresistance at room temperature for a 2.5 nm thick EB-MgO barrier, which is similar to the value for a radio frequency (rf) sputtered barrier with the same junction geometry. The average barrier height of the EB-MgO is 0.48 eV, which is higher than previously reported values for rf-MgO barriers and it increases with increasing annealing temperature. Our results show that EB-MgO could be a simpler alternative to rf-MgO in MTJs without any compromise in the tunnelling magnetoresistance.
- Published
- 2010
47. Spin motive force induced in Fe3O4 thin films with negative spin polarization.
- Author
-
Masaki Nagata, Takahiro Moriyama, Kenji Tanabe, Kensho Tanaka, Daichi Chiba, Jun-ichiro Ohe, Yuki Hisamatsu, Tomohiko Niizeki, Hideto Yanagihara, Eiji Kita, and Teruo Ono
- Abstract
Spin motive force (SMF) is induced by a time and spatial derivative of magnetizations and is dependent on spin polarization. We compare the SMF in FeNi with positive spin polarization with that in a magnetite (Fe
3 O4 ) with negative spin polarization. We observe the SMF induced by a nonuniform ferromagnetic resonance in Fe3 O4 and find that the SMF in Fe3 O4 is opposite to that in FeNi. This result originates from the negative spin polarization of Fe3 O4 . Our clear observation of the SMF depending on the sign of the spin polarization agrees well with the framework of the SMF theory. [ABSTRACT FROM AUTHOR]- Published
- 2015
- Full Text
- View/download PDF
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