A5011051294- Magnetic properties of thin films
- Electron and X-Ray Spectroscopy Techniques
- Advanced Electron Microscopy Techniques and Applications
- Magnetic Properties of Alloys
- Magnetic and transport properties of perovskites and related materials
- Magnetic Properties and Applications
- Physics of Superconductivity and Magnetism
- Advanced Materials Characterization Techniques
- Shape Memory Alloy Transformations
- Metallic Glasses and Amorphous Alloys
- Advanced Condensed Matter Physics
- Force Microscopy Techniques and Applications
- Microstructure and mechanical properties
- Surface and Thin Film Phenomena
- Advancements in Photolithography Techniques
- nanoparticles nucleation surface interactions
- Electronic and Structural Properties of Oxides
- Semiconductor materials and interfaces
- ZnO doping and properties
- Iron oxide chemistry and applications
- Intermetallics and Advanced Alloy Properties
- Multiferroics and related materials
- Semiconductor materials and devices
- Quasicrystal Structures and Properties
- Advanced X-ray Imaging Techniques
Tohoku University
2013-2024
RIKEN Center for Emergent Matter Science
2015-2024
RIKEN
2016-2023
Nihon University
2017-2023
Nippon Soken (Japan)
2022
Osaka City University
2015-2020
Hitachi (Japan)
2010-2020
Advanced Institute of Materials Science
1994-2019
Nihon University Itabashi Hospital
2019
Kyoto University
2018
Three-dimensional forms of skyrmion aggregate, such as a cubic lattice skyrmions, are anticipated to exist, yet their direct observations remain elusive. Here, we report real-space spin configurations the skyrmion-antiskyrmion cubic-lattice in MnGe with very short period (∼3 nm) and hence endowed largest number density. The lattices parallel {100} atomic directly observed using high-resolution Lorentz transmission electron microscopes, simultaneously underlying atomic-lattice fringes.
Topological magnetic (anti)skyrmions are robust string-like objects heralded as potential components in next-generation topological spintronics devices due to their low-energy manipulability via stimuli such fields, heat, and electric/thermal current. While these 2D widely studied, intrinsically 3D electron-spin real-space topology remains less explored despite its prevalence bulky magnets. 2D-imaging studies reveal peculiar vortex-like contrast the core regions of spin textures present...
We have studied the size effect on $\mathrm{L}{1}_{0}$ ordering of FePt (001) nanoparticles epitaxially grown MgO (001). From dark field images using 110 superlattice spots excited by incident electron beam along $[\overline{1}1l]$ $(l=4--6)$, critical for has been evaluated to be $d=1.5--2\phantom{\rule{0.3em}{0ex}}\mathrm{nm}$ below which no occurs. Further, we taken an diffraction pattern each nanoparticle a nanometer-sized and determined respective long-range order parameter $S$...
The magnetic properties of magnetite (Fe3O4) nanowires are investigated by means electron holography, which deduces the information from phase shift electrons. flux is parallel to longitudinal axis (see figure). Observations on magnetization distribution reveal possibility regulating spin current with half-metallic nanowires, owing controlled in 1D form.
Scanning electron microscope (SEM) and scanning ion (SIM) observations were performed to investigate the charging effect related contrast variation for images of conductive non-conductive specimens under Ga+ beam irradiations. The in was investigated by changing coating conditions. It found that basically caused differences atomic number is generally smaller than specimens. On other hand, SEM varied widely, depending on These variations be negative charges accumulated surface SIM changed...
Electron holographic vector field electron tomography visualized three-dimensional (3D) magnetic vortices in stacked ferromagnetic discs a nanoscale pillar. A special holder with two sample rotation axes, both without missing wedges, was used to reduce artifacts the reconstructed 3D vectors. 1 MV holography microscope precisely measure phase shifts. Comparison of observed distributions vortex cores results micromagnetic simulations based on Landau–Lifshitz–Gilbert equation showed that...
Nonpolar LaFeO${}_{3}$ thin films spontaneously polarize when grown on SrTiO${}_{3}$ substrates. This polarization induces anomalous photovoltaic properties, distinct from conventional $p$-$n$ junctions.
Abstract In two-dimensional (2D) NbSe 2 crystal, which lacks inversion symmetry, strong spin-orbit coupling aligns the spins of Cooper pairs to orbital valleys, forming Ising (ICPs). The unusual spin texture ICPs can be further modulated by introducing magnetic exchange. Here, we report unconventional supercurrent phase in van der Waals heterostructure Josephson junctions (JJs) that couples across an atomically thin insulator (MI) Cr Ge Te 6 . By constructing a superconducting quantum...
The structures of melt-spun, and subsequently annealed, Zr70Pd30 alloys, which form a nanosized icosahedral quasicrystalline phase during the primary crystallization amorphous phase, have been investigated by means electron-diffraction pair-distribution-function (PDF) analysis. PDF analysis for this alloy was performed precise measurements elastic halo-electron-diffraction intensities. Possible structure models as-quenched annealed were constructed with help reverse Monte Carlo simulations....
Direct magnetization measurements from narrow, complex-shaped antiphase boundaries (APBs; that is, planar defect produced in any ordered crystals) are vitally important for advances materials science and engineering. However, in-depth examination of APBs has been hampered by the lack experimental tools. Here, based on electron microscopy observations, we report unusual relationship between ferromagnetic spin order Fe70Al30. Thermally induced show a finite width (2–3 nm), within which...