A5027935166- Magnetic properties of thin films
- Magnetic Properties and Applications
- Topological Materials and Phenomena
- Surface and Thin Film Phenomena
- Quantum and electron transport phenomena
- Magnetic and transport properties of perovskites and related materials
- Magneto-Optical Properties and Applications
- Physics of Superconductivity and Magnetism
- ZnO doping and properties
- Theoretical and Computational Physics
- Advanced Condensed Matter Physics
- Magnetic Properties and Synthesis of Ferrites
- Graphene research and applications
- 2D Materials and Applications
- Multiferroics and related materials
- Metallic Glasses and Amorphous Alloys
- Matrix Theory and Algorithms
- Magnetic Properties of Alloys
- Advanced Optimization Algorithms Research
- Diamond and Carbon-based Materials Research
- Advanced Memory and Neural Computing
- nanoparticles nucleation surface interactions
- Semiconductor materials and interfaces
- High-Voltage Power Transmission Systems
- Semiconductor materials and devices
Chinese Academy of Sciences
2015-2025
Czech Academy of Sciences, Institute of Physics
2025
SLAC National Accelerator Laboratory
2025
Institute of Physics
2015-2024
University of Chinese Academy of Sciences
2016-2024
State Key Laboratory of Magnetism
2013-2023
Shanxi University
2020
University of Science and Technology of China
2020
National Laboratory for Superconductivity
2017
CAE (Canada)
2011
Topological insulators (TIs) have emerged as some of the most efficient spin-to-charge convertors because their correlated spin-momentum locking at helical Dirac surface states. While endeavors been made to pursue large "charge-to-spin" conversions in novel TI materials using spin-torque-transfer geometries, reciprocal process "spin-to-charge" conversion, characterized by inverse Edelstein effect length (λIEE) prototypical material (Bi2Se3), remains moderate. Here, we demonstrate that,...
We report electric-field control of magnetism (Co/Pt)3 multilayers involving perpendicular magnetic anisotropy with different Co-layer thicknesses grown on Pb(Mg,Nb)O3–PbTiO3 (PMN–PT) FE substrates. For the first time, interface anisotropy, which results in spin reorientation transition, was demonstrated. The electric-field-induced changes bulk and anisotropies can be understood by considering strain-induced change magnetoelastic energy weakening Pt 5d–Co 3d hybridization, respectively. also...
The epitaxial growth of ultrathin Fe film on Si(111) surface provides an excellent opportunity to investigate the contribution magnetic anisotropy behavior. Here, we present anisotropic magnetoresistance (AMR) effect single crystal vicinal substrate with atomically flat p(2 × 2) iron silicide as buffer layer. Owing tiny misorientation from Fe(111) plane, symmetry magnetocrystalline energy changes six-fold a superposition six-fold, four-fold and weakly uniaxial contribution. Furthermore,...
We propose a general theory of ferromagnetic resonance (FMR) spectroscopy for symmetry-breaking synthetic antiferromagnets (SAFs). Generally, both inhomogeneity and different thickness the two sublayers SAF result in intrinsic symmetry breaking, thus excludes crossing between pure in-phase out-of-phase modes with opposite parity. Alternatively, new frequency branches become hybridization original bare terms breaking induced magnon-magnon coupling, hence generate an indirect gap FMR...
Abstract Bit patterned recording (BPR) has attracted much attention due to its promising potential in achieving high densities magnetic storage devices. The materials with strong perpendicular anisotropy (PMA) are always preferred designing the BPR. Here, Co/Ni multilayers showing d - hybridization induced PMA was studied. In particular, we record ultrafast spin dynamics by means of time-resolved scanning magneto-optical Kerr effect (TRMOKE) microscopy. We able acquire “snapshot” maps sample...
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Antiferromagnetic spin dynamics is important for both fundamental and applied antiferromagnetic spintronic devices; however, it rarely explored by external fields because of the strong exchange interaction in materials. Here, photoinduced excitation ultrafast achieved capping RFeO3 (R = Er or Dy) with an exchange-coupled ferromagnetic Fe film. Compared bare orthoferrite single crystals, which can be triggered effectively laser heating just below phase transition temperature, multimode...
The ability to controllably manipulate the laser-induced ultrafast magnetic dynamics is a prerequisite for future high-speed spintronic devices. optimization of devices requires controllability demagnetization time ${\ensuremath{\tau}}_{M}$ and intrinsic Gilbert damping ${\ensuremath{\alpha}}_{\mathrm{intr}}$. In previous attempts establish relationship between ${\ensuremath{\alpha}}_{\mathrm{intr}}$, rare-earth doping permalloy film with two different mechanisms was not suitable candidate....
Abstract Single-particle band theory has been very successful in describing the structure of topological insulators. However, with decreasing thickness insulator thin films, single-particle is insufficient to explain their structures and transport properties due existence top bottom surface-state coupling. Here, we reconstruct this coupling an equivalently screened Coulomb interaction Bi 2 Se 3 ultrathin films. The thickness-dependent position Dirac point magnitude mass gap are discussed...
The subpicosecond spin-transfer-torque (STT) related to the laser-induced spin current is an effective approach exciting waves in a noncollinear magnetic configuration. However, its validity on excitation of synthetic antiferromagnet still far from conclusive. Here, we investigate impact STT coherent CoFeB/Ru/CoFeB. After pulsed-laser exposure, observe both precessional signals acoustic mode and optical find that their precession amplitudes are configuration-dependent. Not as common...
Ultrafast spin dynamics is the study of evolution degrees freedom on a time scale from picoseconds to attoseconds after being excited by an external field. With development laser technology, ultrafast has presented new opportunities for realizing spintronic devices since 1996. However, despite decades development, many aspects femtosecond magnetism remain unclear. Understanding parameters these processes requires experiments even faster timescale. Attosecond and interaction attosecond pulses...
The laser-induced ultrafast demagnetization of CoFeB/MgO/CoFeB magnetic tunneling junction is exploited by time-resolved magneto-optical Kerr effect (TRMOKE) for both the parallel state (P state) and antiparallel (AP magnetizations between two layers. It was observed that time shorter magnitude larger in AP than those P state. These behaviors are attributed to spin transfer CoFeB layers via hot electrons through MgO barrier. Our observation indicates can be engineered current. opens door...
The exploring of ultrafast demagnetization is a significant subject for understanding the versatility spin dynamics. However, laser-induced process in chiral magnet FeGe has remained elusive. Here, we report processes film with various magnetic structures using time-resolved magneto-optical Kerr effect (TRMOKE) measurements. Our work reveals transition from one-step (type I) to two-step II) by changing ambient temperature, laser fluence, and field. We confirm that mainly results weak...
Fe 3 Pt nanowire arrays were fabricated by electrodeposition of Fe2+ and Pt2+ into anodic aluminum oxide (AAO) templates. X-ray diffraction (XRD) pattern indicates that the crystallites Fe3Pt nanowires are fcc structure with existence strong [110] orientation along axes. Transmission electron microscopy reveals diameter length about 10 400 nm, respectively. Relatively high coercivities parallel to 2.72 kOe at 5 K 1.17 room temperature achieved. The magnetic hysteresis loops demonstrate...
In spintronics applications, ultrafast spin dynamics have to be controlled at femtosecond (fs) timescales via fs-laser radiation. At such timescales, the effect of Gilbert damping factor {\alpha} on demagnetization time should considered. previous explorations for relationship between these two parameters, it was found that theoretical calculations based local spin-flip scattering model do not agree with experimental results. Here, we find in Fe81Ga19(FeGa)/Ir20Mn80(IrMn) bilayers,...
Laser-induced magnetization dynamics is quantitatively investigated in a van der Waals ferromagnetic Cr2Ge2Te6 nanoflake by means of time-resolved Faraday rotation. Under resonance conditions, the angular dependence spin precession gives rise to perpendicular magnetic anisotropy with an effective field 125 ± 8 mT. We further determine damping coefficient, which dominated inhomogeneous broadening regime small while it diminishes intrinsic value 0.006 0.002 at high fields.
The magnon-magnon coupling in synthetic antiferromagnets advances it as hybrid magnonic systems to explore the quantum information technologies. To induce coupling, parity symmetry between two magnetization needs be broken. Here we experimentally demonstrate a convenient method break by asymmetric thickness of magnetic layers and thus introduce Ir-based CoFeB(10 nm)/Ir(tIr=0.6 nm, 1.2 nm)/CoFeB(13 nm). Remarkably, find that weakly uniaxial anisotropy field (~ 20 Oe) makes anisotropic....
The understanding and manipulation of anisotropic Gilbert damping is crucial for both fundamental research versatile engineering optimization. Although several works on have been reported, no direct relationship between the band structure was established. Here, we observed an in Fe/GeTe manipulated by symmetric structures GeTe via angle-resolved photoemission spectroscopy. Moreover, can be modified symmetry structures. Our Letter provides insightful understandings ferromagnets interfaced...
We report an investigation on magnetic anisotropy of Co/Si(111) films deposited at oblique incidence. An in-plane uniaxial (UMA) with the easy axis perpendicular to incident flux plane was observed superimpose sixfold magnetocrystalline Co films. built a total energy model investigate magnetization reversal mechanism around hard axis. The simulated value UMA is Ku=1.7×105 erg/cm3, which consistent Kshape=1.1×105 erg/cm3 calculated from scanning tunneling microscope image. This good agreement...
We adopted a novel method to tune the terrace width of Si(111) substrate by varying direction heating current. It was observed that uniaxial magnetic anisotropy (UMA) Fe films grown on enhanced with decreasing and superimposed weak six-fold magnetocrystalline anisotropy. Furthermore, basis scanning tunneling microscopy (STM) images, self-correlation function calculations confirmed UMA attributed mainly from long-range dipolar interaction between spins surface. Our work opens new avenue...
The magnetic anisotropy is of both scientific and technological interest for magneto-optical material GdFeCo film. We characterize the a 20 nm film from 265 K to 320 via Kerr loops ferromagnetic resonance. With increasing temperature, first-order uniaxial shape increase. However, competition between them causes temperature-driven spin reorientation transition (SRT) effective perpendicular decrease 2.22 × 104 ergs/cm3 (288 K) −1.56 (317 K). positive second-order determines an easy-cone state...
Abstract Emergent topological insulators (TIs) and their design are in high demand for manipulating transmitting spin information toward ultralow‐power‐consumption spintronic applications. Here, distinct states with tailored properties can be achieved a single reduced‐dimensional TI‐superlattice, (Bi 2 /Bi Se 3 )‐(Bi ) N or (□/Bi ( is the repeating unit, □ represents an empty layer) by controlling termination via molecular beam epitaxy. The Bi ‐terminated superlattice exhibits Dirac cone...
Magnetization reversal process and magnetic relaxation of ${\mathrm{Fe}}_{3}\mathrm{Pt}$ nanowire arrays fabricated by electrodeposition have been investigated means micromagnetic simulation magnetization measurements. Time dependence reveals that the exhibit a strong viscosity effect. The coefficients $S$, which are dependent on temperature field, achieve maximum values near coercivity. activation volume ${V}^{*}$, defined as effective involved in process, increases with ${T}^{1∕2}$...