A5031509072- Magnetic properties of thin films
- Magnetic Properties and Applications
- Quantum and electron transport phenomena
- Magnetic Properties of Alloys
- Magnetic and transport properties of perovskites and related materials
- Metallic Glasses and Amorphous Alloys
- Physics of Superconductivity and Magnetism
- ZnO doping and properties
- Advancements in Semiconductor Devices and Circuit Design
- Molecular Junctions and Nanostructures
- Magneto-Optical Properties and Applications
- Metal and Thin Film Mechanics
- Heusler alloys: electronic and magnetic properties
- Surface and Thin Film Phenomena
- Hydrogen Storage and Materials
- Multiferroics and related materials
- Surface Modification and Superhydrophobicity
- Advanced Memory and Neural Computing
- Theoretical and Computational Physics
- Aluminum Alloy Microstructure Properties
- Topological Materials and Phenomena
- Copper Interconnects and Reliability
- Electrocatalysts for Energy Conversion
- Advanced Condensed Matter Physics
- Solidification and crystal growth phenomena
University of Hong Kong
1999-2024
National Institute for Materials Science
2015-2024
National Institute of Advanced Industrial Science and Technology
2021-2024
Shenzhen University
2024
Tohoku University
1991-2022
Spintronics Research Network of Japan
2018-2022
Chinese Academy of Sciences
2002-2022
Qingdao National Laboratory for Marine Science and Technology
2022
Chongqing Jiaotong University
2022
Institute of Oceanology
2022
As rising star materials, single-atom and dual-atom catalysts have been widely reported in the electro-catalysis area. To answer key question: catalysts, which is better for electrocatalytic urea synthesis? we design two types of via a vacancy-anchorage strategy: Pd1 -TiO2 Cu1 nanosheets. An ultrahigh activity 166.67 molurea molPd-1 h1 with corresponding 22.54 % Faradaic efficiency at -0.5 V vs. reversible hydrogen electrode (RHE) achieved over , much higher than that . Various...
We report on a general theory for analyzing quantum transport through devices in the Metal-QD-Metal configuration where QD is dot or device scattering region which contains Rashba spin-orbital and electron-electron interactions. The metal leads may not be ferromagnetic, they are assumed to weakly couple region. Our formulated by second quantizing interaction spectral space (instead of real space), then analyzed within Keldysh nonequilibrium Green's function formalism. causes two main effects...
Manipulation of the magnetization by external energies other than magnetic field, such as spin-polarized current1-4, electric voltage5,6 and circularly polarized light7-11 gives a paradigm shift in nanodevices. Magnetization control ferromagnetic materials only light has received increasing attention both fundamental probe interactions magnetism but also for future high-density recording technologies. Here we show that granular FePt films, designed ultrahigh-density recording, optical...
We have investigated the anomalous Nernst effect (ANE) in $\mathrm{F}{\mathrm{e}}_{1\ensuremath{-}x}\mathrm{G}{\mathrm{a}}_{x}$ alloy films with different Ga atomic compositions ($x=0\ensuremath{-}0.44$) deposited on MgO(001) single-crystalline substrates. found that magnitude of ANE increases increasing $x$ up to $x=0.32$ even though saturation magnetization decreases $x$, suggesting a dominant contribution intrinsic mechanism observed ANE. The reaches...
We study proximity-induced superconductivity in gold nanowires as a function of the length nanowire, magnetic field, and excitation current. Short exhibit sharp superconducting transition, whereas long show nonzero resistance. At intermediate lengths, however, we observe two transitions; normal regions are separated by what call minigap phase. Additionally, detect periodic oscillations differential magnetoresistance. suggest that phase well originate from coexistence with region near center...
Abstract Active control of heat flow is crucial for the thermal management increasingly complex electronic and spintronic devices. In addition to conventional transport engineering, spin caloritronics has received extensive attention as a principle owing its high controllability unique energy conversion symmetry. Here we demonstrate that direction currents generated by spin-caloritronic phenomena can be changed simply illuminating magnetic materials with visible light. The optical realized...
Magnetically responsive structured surfaces enabling multifunctional droplet manipulation are of significant interest in both scientific and engineering research. To realize magnetic actuation, current strategies generally employ well-designed microarrays high-aspect-ratio structure components (e.g., microcilia, micropillars, microplates) with incorporated magnetism to allow reversible bending deformation driven by magnets. However, such magneto-responsive microarray suffer from highly...
We investigated the Ag distribution in a FePtAg-C granular film that is under consideration for heat assisted magnetic recording medium by aberration-corrected scanning transmission electron microscope-energy dispersive X-ray spectroscopy and absorption fine structure. rejected from core of FePt grains during deposition, forming Ag-enriched shell surrounding L10-ordered grains. Since has no solubility both Fe Pt, rejection induces atomic diffusions thereby enhancing kinetics L10-order
We attempted a compositionally graded sputtering process to overcome the phase separation in growth direction FePt-C granular film order realize columnar structure of FePt grains with an aspect ratio larger than 1.5. In problem formation second layer for thickness 6 nm, we deposited by changing carbon concentration during process. The was suppressed, which led overall volume fraction is decisive factor on size grains. Using process, nanogranular films average grain 7.8 10 and perpendicular...
Magnetic nanoparticles such as FePt in the L1 0 phase are bedrock of our current data storage technology. As grains become smaller to keep up with technological demands, superparamagnetic limit calls for materials higher magnetocrystalline anisotropy. This, turn, reduces magnetic exchange length just a few nanometers, enabling structures be induced within nanoparticles. Here, we describe existence spin-wave solitons, dynamic localized bound states excitations, We show time-resolved x-ray...
We theoretically investigate properties of the induced electric field a steady-state spin-current without charge current, using an ``equivalent magnetic charge'' method. Several general formula for are derived which play role ``Biot-Savart law'' and ``Ampere's law.'' Conversely, moving spin is affected by external we derive expression interaction torque.
We report a theoretical analysis of transverse spin current in four-probe graphene nanostructure the absence spin-orbit interaction and magnetic field. The consists finite-size sheet connected to outside world by two zigzag nanoribbons (GNR) armchair nanoribbons, forming cross-shaped two-dimensional device. Due edge state induced magnetism at GNR boundaries, our result shows that pure without an accompanying charge is induced. have calculated conductance atomic first-principles method where...
ZrSiS-type materials represent a large material family with unusual coexistence of topological nonsymmorphic Dirac fermions and nodal-line fermions. As special group ZrSiS family, $\mathit{Ln}\mathrm{SbTe}$ ($Ln=\mathrm{lanthanide}\phantom{\rule{0.16em}{0ex}}\mathrm{rare}\ensuremath{-}\mathrm{earth}$) compounds provide unique opportunity to explore new quantum phases due the intrinsic magnetism induced by $\mathit{Ln}$. Here we report single-crystal growth characterization NdSbTe, previously...
A new micromagnetic method using the hybrid Monte Carlo (HMC) algorithm has been developed, and magnetic properties at finite temperature can be simulated. In this paper, HMC micromagnetics are applied on polycrystalline FePt-C granular films for heat-assisted recording, where significant parameters such as temperature-dependent saturation magnetization M <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">s</sub> (T) measured by experiments. The...
Light-matter interaction at the nanoscale in magnetic materials is a topic of intense research view potential applications next-generation high-density recording. Laser-assisted switching provides pathway for overcoming material constraints high-anisotropy and high-packing density media, though much about dynamics process remains unexplored. We use ultrafast small-angle x-ray scattering an free-electron laser to probe FePt nanoparticles embedded carbon matrix following excitation by optical...