A5010376762- Magnetic Properties and Synthesis of Ferrites
- Magneto-Optical Properties and Applications
- Magnetic properties of thin films
- Magnetic and transport properties of perovskites and related materials
- Multiferroics and related materials
- Electronic and Structural Properties of Oxides
- Advanced Condensed Matter Physics
- Iron oxide chemistry and applications
- Gas Sensing Nanomaterials and Sensors
- Semiconductor materials and devices
- Glass properties and applications
- Advanced Memory and Neural Computing
- Advanced Chemical Sensor Technologies
- ZnO doping and properties
- Copper-based nanomaterials and applications
- Analytical Chemistry and Sensors
- Terahertz technology and applications
- Quantum and electron transport phenomena
- Physics of Superconductivity and Magnetism
- Theoretical and Computational Physics
- Neural Networks and Reservoir Computing
- Surface and Thin Film Phenomena
- Photonic and Optical Devices
- Surface Roughness and Optical Measurements
- Spectroscopy and Laser Applications
The University of Tokyo
2016-2025
Spintronics Research Network of Japan
2017-2025
Tokyo University of Information Sciences
2021-2025
Nara Institute of Science and Technology
2007
Panasonic (Japan)
2007
Japan Science and Technology Agency
2007
Osaka University
2004-2007
Kyoto University
2002-2003
Osaka Research Institute of Industrial Science and Technology
2003
Japan Synchrotron Radiation Research Institute
1988
Optical reflectivity spectra of (La, Sr)2CuO4 and YBa2Cu3Oy have been measured over a wide spectral range as high 40 eV. Although overall features the observed are explained well by results available band calculations, differ significantly from calculation in low-energy region below 5 eV, where spectrum would presumably be dominated transitions between states involving Cu 3d O 2p or charge-transfer (CT) excitation states. In contrast to calculation, absorption that probably corresponds Cu–O...
CoPt and FePt3 bimetallic nanowires were produced in the inner cavity of TMV by reducing K2PtCl4 (NH4)2Co(SO4)2 or (NH4)2Fe(SO4)2 using NaBH4 under ultrasonic irradiation. The obtained molecular ratios Co2+:Pt2+ = 3:1 mainly composed ferromagnetic.
Spinel-type ferrites are widely used in practical applications. A fascinating property of Zn-Ni which reveals a direction for application is reported. large negative magnetoresistance effect has been observed ZnFe2O4 and Ni substituted Zn1−xNixFe2O4 spinel structure. These materials either ferrimagnetic or paramagnetic at room temperature spin (cluster) glass transition was found some compositions low temperatures. The parabolic linear with respect to applied field up 9 T depending on the It...
We used genetically modified tube-shaped tobamoviruses to produce 3 nm aligned magnetic nanoparticles. Amino acid residues facing the central channel of virus were increase number nucleation sites. Energy dispersive X-ray spectroscopy and superconducting quantum interference device analysis suggest that particles consisted Co−Pt alloy. The use tobamovirus mutants is a promising approach making variety components can be applied fabricate nanometer-scaled electronic devices.
Abstract Rare‐earth iron garnets (RIG, R 3 Fe 5 O 12 ) are insulating ferrimagnets with high inversion symmetry because of their centrosymmetric cubic crystal structure. However, this centrosymmetry can be reduced by introducing a non‐uniform strain, leading to tetragonally distorted lattice In study, the strain‐induced distortions and symmetry‐breaking features investigated in compressively strained Sm tensile‐strained Lu thin films around critical thicknesses. Experiments indicate that...
Substituting rare-earth Eu ions with a large atomic number into 3d transition metal oxides can precisely control their magnetic properties through significant spin-orbit coupling, leading to noncollinear magnetism. Experimental investigations are combined density functional theory explore site-selective Eu3+ substitution as strategy enhance the of Fe3O4 thin films. The location Eu3+, that is, octahedral versus tetrahedral, is confirmed by electrical resistivities and valence band...
This paper demonstrates intrinsic spin-to-charge current conversion in a two-dimensional electron gas using an all-epitaxial single-crystal heterostructure of LaSrMnO${}_{3}$/ LaAlO${}_{3}$ (LAO)/ SrTiO${}_{3}$ (STO), known to suppress spin scattering. As temperature decreases 20 K, the efficiency is enhanced. The authors complement their experiments with band-structure calculation that agree observations and predict further enhancement by controlling density relaxation time carriers.
Spin waves (SWs), an ultra-low power magnetic excitation in ferro or antiferromagnetic media, have tremendous potential as transport less data carriers for post-CMOS technology using their wave interference properties. The concept of magnon originates from optical interference, resulting a historical taboo maintaining identical wavevector interference-based devices. This makes the attainment on-chip design reconfigurability challenging owing to difficulty phase tuning via external fields....
We investigate the magnetic properties of La2/3Sr1/3MnO3 (LSMO) membranes released from an SrTiO3 (STO) substrate by selectively etching Sr4Al2O7 sacrificial buffer layer. The moment and Curie temperatures (TC) LSMO improve significantly over their substrate-bound counterparts. attribute these enhancements to suppressing strain oxygen octahedral rotations that are present in films. Moreover, comparing hysteresis loops obtained with fields applied along several crystallographic orientations...
Abstract Gain-dissipative Ising machines (GIMs) are dedicated devices that can rapidly solve combinatorial optimization problems. The noise intensity in traditional GIMs should be significantly smaller than its saturated fixed-point amplitude, indicating a lower margin. To overcome the existing limit, this work proposes an overdamped bistability-based GIM (OBGIM). Numerical test on uncoupled spin network show OBGIM has different bifurcation dynamics from of GIM. Moreover, domain clustering...
Rh-substituted α-Fe2O3 (Fe2-xRhxO3; 0.0≤x≤2.0) thin films were grown on α-Al2O3(110) substrates with a Ta-doped SnO2 electrode layer by pulsed laser deposition. Highly oriented epitaxial pure corundum structures successfully fabricated over the entire compositional range. The optical absorption spectra of indicate narrowing bandgap increasing Rh content. Consequently, photoelectrochemical performance was improved in films. We found that optimum content lies at around x=0.2, where...
Abstract Reservoir computing is a brain heuristic paradigm that can complete training at high speed. The learning performance of reservoir system relies on its nonlinearity and short-term memory ability. As physical implementation, spintronic has attracted considerable attention because low power consumption small size. However, few studies have focused developing the ability material itself in spintronics computing. Among various magnetic materials, spin glass known to exhibit slow...
Strontium titanate (SrTiO3 or STO) is important for oxide-based electronics as it serves a standard substrate wide range of high-temperature superconducting cuprates, colossal magnetoresistive manganites, and multiferroics. Moreover, in its heterostructures with different materials, STO exhibits broad spectrum physics such superconductivity, magnetism, the quantum Hall effect, giant thermoelectric ionic conductivity, most which emerge two-dimensional (2D) electron gas (2DEG) formed at an...
To mimic the human olfactory system, an electronic nose (E-nose, also known as artificial olfactory) has been proposed based on a multiple gas sensor array and pattern recognition algorithm. Detection of volatile organic components (VOCs) many potential applications in breath analysis, food quality estimation, indoor outdoor air monitoring, etc. In this study, facile single-needle electrospinning technology was applied to develop four different semiconductor metal oxide (MOS) nanofibers...
The development of semiconductor gas sensors has potential applications in breath analysis to realize noninvasive health monitoring. Herein, tin oxide (SnO2) and copper (CuO) heterocomposite nanofibers were fabricated by electrospinning Sn Cu precursors on Si substrates, followed calcination sensing ammonia (NH3) with high sensitivity. surface states SnO2–CuO nanofibers, different SnO2:CuO ratios, before after reveal diffusion rates SnO2 CuO. Scanning electron microscopy images indicated...
Recent developments in semiconductor-based surface-enhanced Raman scattering (SERS) have achieved numerous advancements, primarily centered on the chemical mechanism. However, role of electromagnetic (electromagnetic mechanism) contribution advancing semiconductor SERS substrates is still underexplored. In this study, we developed a substrate based densely aligned α-type MoO3 (α-MoO3) nanorods (NRs) with rectangular parallelepiped ribbon shapes width measuring several hundred nanometers....
Abstract Flexoelectricity is a universal property associated with dielectric materials, wherein they exhibit remanent polarization induced by strain gradient. Rare-earth iron garnets, R 3 Fe 5 O 12 , are ferrimagnetic insulators useful magnetic properties. However, unlikely to show because of their centrosymmetric structure. Here, induce flexoelectricity, we investigate various rare-earth iron-garnet thin films deposited on lattice-mismatched substrates. Atomic-resolution scanning...
Abstract Gain‐dissipative Ising machines (GIMs) are a type of quantum analog equipment that can rapidly determine the optimal solution for combinatorial optimization problems. When noise intensity is significantly lower than fixed point system, performance GIM not influenced by fluctuation intensity. However, in this study limited to Gaussian white noise. The influence prevalent colored on GIMs has been researched. In study, common‐colored numerically investigated. results domain clustering...
The two-dimensional electron gas (2DEG) formed at interfaces between SrTiO3 (STO) and other oxide insulating layers is promising for use in efficient spin-charge conversion due to the large Rashba spin-orbit interaction (RSOI). However, these on STO prevent propagation of a spin current injected from an adjacent ferromagnetic layer. Moreover, mechanism spin-current flow still unexplored. Here, using strongly correlated polar-metal LaTiO3+δ (LTO) interlayer 2DEG LTO/STO interface...
Developing technology to realize oxide-based nanoscale planar integrated circuits is in high demand for next-generation multifunctional electronics. Oxide can have a variety of unique functions, including ferromagnetism, ferroelectricity, multiferroicity, superconductivity, and mechanical flexibility. In particular, spin-transistor applications, the wide tunability physical properties due presence multiple oxide phases valuable precise conductivity matching between channel ferromagnetic...