A5082629938- Magneto-Optical Properties and Applications
- Magnetic properties of thin films
- Magnetic Properties and Synthesis of Ferrites
- Gas Sensing Nanomaterials and Sensors
- Multiferroics and related materials
- Analytical Chemistry and Sensors
- Advanced Memory and Neural Computing
- Advanced Chemical Sensor Technologies
- Quantum and electron transport phenomena
- Photonic and Optical Devices
- Iron oxide chemistry and applications
- Neural Networks and Reservoir Computing
- stochastic dynamics and bifurcation
- Glass properties and applications
- Magnetic Properties and Applications
- Quantum Information and Cryptography
- Quantum Computing Algorithms and Architecture
- Terahertz technology and applications
- Magnetic and transport properties of perovskites and related materials
- Semiconductor materials and devices
- ZnO doping and properties
- Photorefractive and Nonlinear Optics
- Plasmonic and Surface Plasmon Research
- Ga2O3 and related materials
- Photonic Crystals and Applications
The University of Tokyo
2016-2025
Tokyo University of Information Sciences
2021-2023
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...
CuO nanowire/microflower structure on Cu foil is synthesized by annealing a Cu(OH)2 nanowire/CuO microflower at 250 °C in air. The with its large surface area leads to an efficient catalysis and charge transfer glucose detection, achieving high sensitivity of 1943 μA mM(-1) cm(-2), wide linear range up 4 mM low detection limit μM for amperometric sensing alkaline solution. With second consecutive growth nanowires the microflowers, obtained nanowire/microflower/nanowire further increases 2424...
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...
Detection of parts-per-trillion (ppt)-level acetone gas molecules at room temperature using suspended graphene on SiO2 micropillars has rarely been achieved solid-state devices or surface acoustic wave (SAW) sensors. This paper presents the effect and as a guiding sensing layer to detect gas. The integration with introduces coupled resonance arising from interaction between mechanical vibrations micropillars. leads formation hybrid modes when natural frequencies align. coupling mechanism...
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...
ABSTRACT Recent progress in gas‐sensing technology has enabled the rapid collection and highly sensitive analysis of skin gases associated with body odour. Skin can be collected less invasively, more continuously, consciously than blood or urine. Patients end‐stage kidney disease (ESKD) have a characteristic uremic odour that fades after initiating replacement therapy. We investigated potential for objectively quantitatively evaluating factors underlying uraemia. were using passive flux...
This study investigates the effects of epitaxial strain on crystal structure, magnetization, and spin wave propagation characteristics rare-earth iron garnet thin films. Thin films Y3Fe5O12 (YIG) Lu3Fe5O12 (LuIG), each with identical thicknesses, are grown Gd3Ga5O12 (GGG), substituted Gd3(GaMgZr)5O12 (SGGG), Y3Al5O12 (YAG) substrates, causing systematic variation in based substrate lattice constants. Exceeding a certain critical thickness for relaxation, strained epitaxy transitions to...
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....
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...
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...
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...
To improve the quality of modern life in current society, low-power, highly sensitive, and reliable healthcare technology is necessary to monitor human health real-time. In this study, we fabricated partially suspended monolayer graphene surface acoustic wave gas sensors (G-SAWs) with a love-mode effectively detect ppt-level acetone molecules at room temperature. The sputtered SiO2 thin film on black 36°YX-LiTaO3 (B-LT) substrate acted as guiding layer, reducing noise insertion loss. G-SAWs...
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...
Superparamagnetic tunnel junctions (SMTJs) are spintronic nanodevices that can oscillate spontaneously under the influence of thermal noise. Studies have proposed SMTJs be modeled as magnetic neurons by subjecting them to electrical Gaussian white noise and subsequently synchronized subthreshold driving. Considering non-Gaussian background in industrial applications, this study investigated levy on SMTJ synchronization. The results revealed with weak pulse characteristics used promote...
Polyethylene glycol (PEG) is a well-known water retention agent in biomedical products, the hydration efficiency of which affected by its molecular weight. Using broadband dielectric spectroscopy (100 MHz–18 THz), state PEG aqueous solutions with various weights was quantitatively evaluated. As weight increases, restriction strength increases potency, while number molecules decreases. Owing to opposite changes and strength, measured collective hydrogen bond (HB) shows negligible dependence....