A5072401009- Magnetic properties of thin films
- Particle physics theoretical and experimental studies
- Hydrogen Storage and Materials
- Magnetic Properties and Applications
- Quantum Chromodynamics and Particle Interactions
- Heusler alloys: electronic and magnetic properties
- High-Energy Particle Collisions Research
- Postharvest Quality and Shelf Life Management
- Magnetic Properties of Alloys
- Spectroscopy and Chemometric Analyses
- Plant Physiology and Cultivation Studies
- Metal and Thin Film Mechanics
- Greenhouse Technology and Climate Control
- Metallic Glasses and Amorphous Alloys
- Catalytic Processes in Materials Science
- Structural Behavior of Reinforced Concrete
- Advancements in Solid Oxide Fuel Cells
- Dark Matter and Cosmic Phenomena
- Fuel Cells and Related Materials
- Intermetallics and Advanced Alloy Properties
- Catalysis and Hydrodesulfurization Studies
- Innovative concrete reinforcement materials
- Food composition and properties
- Combustion and Detonation Processes
- Berry genetics and cultivation research
Japan Aerospace Exploration Agency
2012-2024
National Livestock Breeding Center
2023-2024
Shinshu University
2022-2024
Saga University
1997-2023
Tohoku University
2013-2022
Institute for Multidisciplinary Research
2021
Sendai University
2021
Institute for Materials Research, Tohoku University
2014-2015
SPring-8 (Japan)
2014
SPring-8
2014
The present study aims to provide new insights into the temperature-dependent spectral variations in near infrared (NIR) region of spectrum water by comparing chemometrics with spectroscopic analysis. Fourier transform (FT)-NIR spectra 9000–5500 cm −1 have been measured over a temperature range 5–85°C. observed changes analysed both chemometrics, such as multilinear regression (MLR), principal component (PCR) and partial least squares (PLS) regression, data analyses, second derivative,...
Material dependence of the anomalous Nernst effect (ANE) in perpendicularly magnetized ordered-alloy thin films is systematically investigated. The ANE was found to have a tendency increase simply as uniaxial magnetic anisotropy increased at room temperature. increases temperature from 10 300 K for all materials. However, signs Fe-based ordered-alloys (L10-FePt and L10-FePd) Co/Ni multilayer are opposite those Mn-based (L10-MnGa D022-Mn2Ga). Ordered-alloys with larger anisotropies reveal...
We prepared L10-ordered FeNi alloy films by alternate deposition of Fe and Ni monatomic layers, investigated their magnetic anisotropy. employed a non-ferromagnetic Au–Cu–Ni buffer layer with flat surface good lattice matching to L10-FeNi. An L10-FeNi film grown on Au6Cu51Ni43 showed large uniaxial anisotropy energy (Ku = 7.0 × 106 erg cm−3). Ku monotonically increased the long-range order parameter (S) L10 phase. Fe–Ni composition dependence alternating 1 − x + layers (− 0.4 < 0.4)....
Heusler alloys (X2YZ) are well-established intermetallic compound materials in various fields because their function can be precisely adjusted by elemental substitution (e.g., X2YZ1-xZ' x ). Although catalysts started attracting attention recently, catalysis researchers not familiar with alloys. We report potential as novel focusing on the selective hydrogenation of alkynes. found that Co2MnGe and Co2FeGe have great alkene selectivity. Mutual Mn Fe (Co2Mn Fe1-x Ge) enhanced reaction rate...
AbstractFeNi with the L10-ordered structure is formed over an astronomical timescale in meteorites. In this study, severe plastic deformation using high-pressure torsion (HPT) employed for production of L10 laboratory. Its formation confirmed by X-ray diffraction analysis and transmission electron microscopy. Processing elemental nanopowders HPT effective method phase, which enhanced addition Co to FeNi or annealing after HPT. The phase must be associated diffusion through HPT.Keywords:...
For over a century, Heusler alloys (X2YZ; X, Y: transition metals, Z: typical metals) have attracted attention as magnetic materials. Nowadays, they are also popular thermoelectric and shape memory However, until very recently, had been almost unknown catalysts. We conceived that could be ideal candidates for catalysts because (1) so many elemental sets (2) can partially substituted with other elements (e.g. X2YZ1–xZ'x) in cases. first investigated variety of then discovered effective...
Epitaxial L10-ordered FeNi thin films were artificially fabricated on a nonmagnetic AuNi buffer layer by using an alternate monatomic deposition. A uniaxial magnetic anisotropy energy of the was estimated to be 5.8 × 106 erg/cm3 from magnetization measurements, which is largest among values reported grown buffers. long-range order parameter 0.330 grazing incidence X-ray diffraction (GI-XRD) synchrotron radiation. We also investigated relation between ratio c-axis lattice constant a-axis (c/a...
L1 0 -FeNi films were grown by alternate monatomic layer deposition on Au–Cu–Ni buffer layers at several substrate temperatures ( T s ), and the relation between uniaxial magnetic anisotropy energy K u ) long-range chemical order parameter S was investigated. A large of (7.0 ±0.2) ×10 6 erg/cm 3 0.48 ±0.05 obtained. The value larger than those reported previously for artificially synthesized FeNi films. It first found that both increased with , roughly proportional to .
We present the general properties of multihadron final states produced by e+e− annihilation at center-of-mass energies from 52 to 57 GeV in AMY detector KEK collider TRISTAN. Global shape, inclusive charged-particle, and particle-flow distributions are presented. Our measurements compared with QCD+fragmentation models that use either leading-logarithmic parton-shower evolution or QCD matrix elements parton level, string cluster fragmentation for hadronization.Received 20 November...
We investigated the origin of strong magnetic anisotropy energy (MAE) in L10-type ordered FeNi phase by angular-dependent circular dichroism. Our findings showed that orbital moment Fe has a significant angular dependence exhibits maximum value at [001] direction corresponding perpendicular to plane. The calculated uniaxial when considering spin–orbit (SO) interaction shows quantitatively good agreement with volume MAE. concluded 3d electrons results MAE L10-FeNi and ascribe this via...
To understand the hard magnetism of L10-type ordered FeNi alloy, we extracted L10-FeNi phase from a natural meteorite, and evaluated its fundamental solid-state properties: sample composition, magnetic hysteresis, crystal structure electronic structure. We executed multidirectional analyses using scanning electron microscopy with an probe micro-analyzer (SEM-EPMA), superconducting quantum interference device (SQUID), x-ray diffraction (XRD) circular dichroism (MCD). As result, found that...
In this study, we investigated the catalytic properties of various Heusler alloys for hydrogenation propyne and oxidation carbon monoxide. For hydrogenation, Co2FeGe alloy showed a higher activity than that elemental Co, where neither Fe nor Ge any activity. This clearly indicates an alloying effect. monoxide, although most significant change in during measurement due to irreversible alloy, Co2TiSn very small change. The results indicate stability can be tuned by employing appropriate set elements.
The atomic structure of a 0.2 atom % Pt-doped complex metallic alloy, monoclinic Al13Fe4, was investigated using single crystal prepared by the Czochralski method. High-angle annular dark-field scanning transmission electron microscopy showed that Pt atoms were dispersed as and substituted at Fe sites in Al13Fe4. Single-crystal X-ray structural analysis revealed preferentially substitute Fe(1). Unlike those have been reported, surface layers lower activity selectivity than Al2Pt bulk for...
L10-ordered FeNi, showing high uniaxial magnetic anisotropy (K u), is promising as a 'rare metal-free' K u material. We have worked on FeNi thin films prepared by two methods: one molecular beam epitaxy (MBE) with alternate deposition of Fe and Ni monatomic layers, the other sputtering co-deposition or multilayer-deposition followed rapid thermal annealing (RTA). For MBE layer (leading to stoichiometric composition: 50 at.%– at.%), clear relationship between long-range order parameter S...
An FeNi film with a metastable L10-ordered phase was fabricated by an alternate monatomic layer deposition. Fe monolayer and Ni were alternately grown on Cu0.6Ni0.4 binary buffer layer. A (001) L10-FeNi superlattice peak, which indicates the formation of L10 phase, clearly observed X-ray diffraction. long-range order parameter S estimated to be 0.5 ± 0.1. It found that has uniaxial magnetic anisotropy along c-axis magnetization measurement. The energy Ku evaluated (5.0 0.1) × 106 erg/cc.
L10-type ordered FeNi alloy is a good candidate material for rare-earth-free permanent magnets due to its large saturation magnetization, uniaxial magnetic anisotropy (Ku) and high Curie temperature. Previously, we investigated the fundamental properties of L10–FeNi by preparing single crystal films alternate deposition Fe Ni monatomic layers. In present study, influences addition Co on structural films. Three types addition, with substitution layers, layers both were performed. X-ray...
We studied on the magnetic damping constants (α) for L10-FeNi and disordered FeNi employing three kinds of measurement methods. An thin film exhibited high perpendicular anisotropy 7.1 × 106 erg cm−3. At fields (H) lower than 2 kOe, α was estimated to be 0.091 ± 0.003. However, it reduced down 0.013 0.001 with H, indicating that extrinsic contributions enhance α. The intrinsic = comparable 0.009 0.002 FeNi. This suggests is a candidate achieving low magnetization simultaneously.
We present the charged-particle multiplicity distributions for ${e}^{+}{e}^{\ensuremath{-}}$ annihilation at center-of-mass energies from 50 to 61.4 GeV. The results are based on a data sample corresponding total integrated luminosity of 30 ${\mathrm{pb}}^{\ensuremath{-}1}$ obtained with AMY detector KEK storage ring TRISTAN. deviate significantly modified Poisson and pair distributions, but follow Koba-Nielsen-Olesen scaling well reproduced by LUND parton-shower model.
A theory of the optical band shape for A1g → T1u transition is formulated using independent ordering approximation. The covers all regions temperature and linear electron phonon coupling strength, takes account dispersion. It shown that even within interaction, asymmetric three-headed structure appears in at very low its high energy peak disappears. effect quadratic interactions also considered by moment method, dependence skewness kurtosis discussed.
FeNi films were fabricated by sputtering and rapid thermal annealing on thermally amorphous substrates to realize the formation of an L10-FeNi phase a simple method. Structural magnetic properties investigated varying temperature. superlattice peaks not observed in X-ray diffraction patterns, indicating no L10-ordered phase, however, surface structure systematically changed with Magnetization curves also revealed drastic change depending temperature, which indicates close relation between...