A5074300183- Magnetic properties of thin films
- Magneto-Optical Properties and Applications
- Magnetic Properties and Applications
- Advanced Memory and Neural Computing
- Magnetic and transport properties of perovskites and related materials
- Magnetic Properties of Alloys
- Advanced Condensed Matter Physics
- ZnO doping and properties
- Advanced Fiber Optic Sensors
- Photoacoustic and Ultrasonic Imaging
- Characterization and Applications of Magnetic Nanoparticles
- Phase-change materials and chalcogenides
- Physics of Superconductivity and Magnetism
- Perovskite Materials and Applications
- Multiferroics and related materials
- Terahertz technology and applications
- Neural Networks and Applications
- Gyrotron and Vacuum Electronics Research
- MXene and MAX Phase Materials
- Ferroelectric and Negative Capacitance Devices
- High-pressure geophysics and materials
- Metallic Glasses and Amorphous Alloys
- Magnetic Bearings and Levitation Dynamics
- Topological Materials and Phenomena
- Solidification and crystal growth phenomena
Hefei Institute of Technology Innovation
2021-2024
Beihang University
2021-2024
Institut Jean Lamour
2016-2023
Université de Lorraine
2016-2023
University of California, San Diego
2020-2021
Centre National de la Recherche Scientifique
2016-2021
University Memory and Aging Center
2020
Spintronic devices use spin instead of charge to process information and are widely considered as promising candidates for next-generation electronic devices. In past decades, the main motivation in spintronics has been discover new mechanisms novel material systems improve both device performance application prospects spintronics. Recently, researchers have found that ferrimagnetic materials—in which sublattices coupled antiferromagnetically—offer an emerging platform realizing...
Magnetic skyrmions are topologically nontrivial spin textures which hold great promise as stable information carriers in spintronic devices at the nanoscale. One of major challenges for developing novel skyrmion-based memory and logic is fast controlled creation magnetic ambient conditions. Here we demonstrate single ultrafast (35-fs) laser pulse-induced generation skyrmion bubbles bubble lattices from a ferromagnetic state sputtered ultrathin films room temperature. The density increases...
Abstract Spintronics exploit spin‐orbit coupling (SOC) to generate spin currents, torques, and, in the absence of inversion symmetry, Rashba and Dzyaloshinskii–Moriya interactions. The widely used magnetic materials, based on 3d metals such as Fe Co, possess a small SOC. To circumvent this shortcoming, common practice has been utilize large SOC nonmagnetic layers 5d heavy (HMs), Pt, currents turn, exert torques layers. Here, new class material architectures is introduced, excluding HMs, for...
We investigate spin-orbit torque (SOT)-induced switching in rare-earth-transition metal ferrimagnetic alloys using W/CoTb bilayers. The current is found to vary continuously with the alloy concentration, and no reduction observed at magnetic compensation point despite a very large SOT efficiency. A model based on coupled Landau-Lifschitz-Gilbert (LLG) equations shows that density scales effective perpendicular anisotropy which does not exhibit strong compensation, explaining behavior of...
Spintronic thin films were shown to be promising high-performance broadband terahertz (THz) emitters. For spintronic ferromagnet/heavy metal heterostructures, THz emission arises from three mechanisms: the magnetic dipolar radiation due ultrafast demagnetization, transient current spin-charge conversion, and anomalous Hall effect. Here, we demonstrate that mechanisms show distinct dependences on thickness of ferromagnetic layer. With insertion an ultrathin ${\mathrm{Al}}_{2}{\mathrm{O}}_{3}$...
Ultrafast manipulation of magnetic order has challenged the understanding fundamental and dynamic properties materials. So far single-shot switching been limited to ferrimagnetic alloys, multilayers, designed ferromagnetic (FM) heterostructures. In FM/antiferromagnetic (AFM) bilayers, exchange bias (H
Abstract The aspiration of electronic technologies that are resistant to high‐energy cosmic radiation is essential for current harsh environment exploration. Integrated circuits mostly require post‐processing after designing, making their structures more complex than the standard systems. Thus, unique designs and strategies developed enable high tolerance space electronics in nuclear avionic applications. wide bandgap semiconductor (WBG) materials with excellent electronic/optical properties...
Manipulating magnetic skyrmions by means of a femtosecond (fs) laser pulse has attracted great interest due to their promising applications in efficient information-storage devices with ultralow energy consumption. However, the mechanism underlying creation induced an fs is still lacking. As result, key challenge reveal pathway for massive reorientation magnetization from trivial nontrivial topological states. Here, we studied series ferrimagnetic CoHo alloys and investigated effect single...
Single-pulse magnetization switching by femtosecond laser pulses is the fastest way to manipulate magnetization. To date, among rare-earth transition metal alloys, single-pulse limited Gd-based structures. Here, we demonstrate ultrafast of Tb-dominant CoTb alloys within several tens picoseconds. Our further analysis shows that reversal linked heating and an external field.
We report a systematic study of current-induced perpendicular magnetization switching in W/Co$_{x}$Tb$_{1-x}$/Al thin films with strong magnetic anisotropy. Various Co$_{x}$Tb$_{1-x}$ ferrimagnetic alloys different compensation temperatures are presented. The systems characterized using MOKE, SQUID and anomalous Hall resistance at cryostat temperature ranging from 10 K to 350 K. current-switching experiments performed the spin-orbit torque geometry where current pulses injected plane...
Deterministic all-optical control of magnetization without an applied magnetic field has been reported for different materials such as ferrimagnetic and ferromagnetic thin films granular recording media. These findings have challenged the understanding helicity-dependent switching opened many potential applications future information, memory storage technologies. Here we demonstrate optical antiferromagnetic layer through exchange bias interaction using helicity a femtosecond pulsed laser on...
All-optical helicity-dependent switching in ferromagnetic layers has revealed an unprecedented route to manipulate magnetic configurations by circularly polarized femtosecond laser pulses. In this work, rare-earth free synthetic ferrimagnetic heterostructures made from two antiferromagnetically exchange coupled are studied. Experimental results, supported numerical simulations, show that the designed structures enable all-optical which is controlled, not only light helicity, but also...
Spintronic thin films are considered as one of the promising terahertz (THz) source candidates, owing to their high performance and low cost. Much effort has been made achieve spintronic THz sources with broadband conversion efficiency. However, development emitters good compatibility, cost, miniaturized technology still faces many challenges. Therefore, it is urgent extend commercial portable satisfy practical applications. Herein, we design a new generation composed an alternating...
To improve spin-transfer-torque magnetic random-access memory (STT-MRAM) devices, high thermal stability of states and efficient switching are required, both which depend on the energy barrier for switching. In characterizing that barrier, this study reveals an asymmetry in transition between two depends initial state, would not occur a uniform field. The is likely associated with inhomogeneities fringe field at edge device. This result expected to be important engineering tomorrow's...
Recently, SnSe has been found to possess a remarkable thermoelectric performance. As an isostructural compound SnSe, SnS contains more environmentally compatible and earth abundant element, which enables promising material for commercial application. In this work, we have performed systematic studies of the crystal structures lattice vibrations by means neutron total scattering, Raman scattering measurements, first-principle calculations. A structural transition observed both temperature...
Antiferromagnets offer great potential for high-speed data processing applications, as they can expend spintronic devices from a static storage and gigahertz frequency range to the terahertz range. However, their zero net magnetization makes them difficult manipulate detect. In recent years, there has been lot of attention given ultrafast manipulation magnetic order using ultra-short single laser pulses, but it remains unknown whether similar scenario be observed in antiferromagnets. this...
Two-dimensional (2D)-based PN-heterojunction revealed a promising future of atomically thin optoelectronics with diverse functionalities in different environments. Herein, we reported p-GaSe/n-HfS2 van der Waals (vdW) heterostructure for high-performance photodetectors and investigated the laser irradiation effect on fabricated device. The 2D vdW high photoresponsivity 1 × 104 A W-1 photocurrent value 377 nA due to unique type-II band alignment enhanced surface potential under light...
Laser-driven manipulation of magnetic skyrmions holds great promise for the development next-generation information memory devices due to flexibility optical modulation. In this study, we theoretically present an approach generating and manipulating stable topological spin textures using a light-induced radially polarized field, along with ability easily control quasiparticles by adjusting intensity input beam. The generated can shrink into stabilized quasiparticle size significantly smaller...
Abstract The Dzyaloshinskii–Moriya interaction (DMI) in magnetic systems stabilizes spin textures with preferred chirality, applicable to next‐generation memory and computing architectures. In perpendicularly magnetized heavy‐metal/ferromagnet films, the interfacial DMI originating from structural inversion asymmetry strong spin‐orbit coupling favors chiral Néel‐type domain walls (DWs) whose energetics mobility remain at issue. Here, a new effect is characterized which domains expand...
Recently discovered massive Dirac fermions and room temperature skyrmions in the ferromagnetic kagome metal Fe3Sn2 have attracted extensive attention due to potential applications topological spintronic devices. Because of its centrosymmetric lattice, spin texture arises primarily from competition between anisotropy exchange interaction. In this Letter, we identified spin-reorientation at around 80 K by magnetization AC-susceptibility measurements. The evolution is revealed neutron powder...
We report the generation of skyrmions under combined influence applied perpendicular magnetic fields and electrical currents in Pt/Co/Os/Pt thin films. Under no current, are found to nucleate at specific defect sites distributed throughout film remain pinned these for small dc $(<0.05\mathrm{MA}/\mathrm{c}{\mathrm{m}}^{2})$ . For larger $(<0.05\mathrm{MA}/\mathrm{c}{\mathrm{m}}^{2})$, can either move or elongate direction current flow form stripe domains. further observed...
Ultrafast manipulation of magnetic order has challenged our understanding the fundamental and dynamic properties materials. So far single shot switching been limited to ferrimagnetic alloys multilayers. In ferromagnetic (FM)/antiferromagnetic (AFM) bilayers, exchange bias (He) arises from interfacial coupling between two layers reflects microscopic orientation antiferromagnet. Here we demonstrate possibility antiferromagnet (change sign amplitude He) with a femtosecond laser pulse in...
Optical control of the exchange bias field in IrMn/[Co/Pt]N heterostructures has been recently demonstrated. We show that this phenomenon can be used to create specific nucleation areas and even decide preferential direction propagation domain wall inside these preferred nucleation. Using different features a femtosecond laser, such as helicity, fluence, number pulses, we designed robust patterns various shapes magnetic properties host for observations. Our finding provides an alternative...