A5027695835- Magnetic properties of thin films
- Magnetic and transport properties of perovskites and related materials
- Magnetic Properties and Applications
- Magneto-Optical Properties and Applications
- Multiferroics and related materials
- Quantum and electron transport phenomena
- ZnO doping and properties
- Physics of Superconductivity and Magnetism
- Advanced Condensed Matter Physics
- Advanced Memory and Neural Computing
- Theoretical and Computational Physics
- Magnetic Properties of Alloys
- Terahertz technology and applications
- Ferroelectric and Piezoelectric Materials
- Advancements in Semiconductor Devices and Circuit Design
- Electronic and Structural Properties of Oxides
- Characterization and Applications of Magnetic Nanoparticles
- Topological Materials and Phenomena
- Semiconductor materials and devices
- Metallic Glasses and Amorphous Alloys
- Semiconductor Quantum Structures and Devices
- Surface and Thin Film Phenomena
- Magnetic Field Sensors Techniques
- 2D Materials and Applications
- Heusler alloys: electronic and magnetic properties
Institute of Physics
2016-2025
Chinese Academy of Sciences
2016-2025
University of Chinese Academy of Sciences
2017-2024
Czech Academy of Sciences, Institute of Physics
2024
National Laboratory for Superconductivity
2006-2023
University of Science and Technology of China
2019-2023
Nanjing University
1991-2021
State Key Laboratory of Magnetism
2005-2021
University of York
2021
Songshan Lake Materials Laboratory
2019
Here, we report on the experimental discovery of biskyrmion magnetic nanodomains at RT and observation a biskyrmion-derived topological Hall effect (THE) in centrosymmetric hexagonal MnNiGa magnet. Using phase reconstruction technique based transport-of-intensity equation (TIE), established texture spin. Results from Lorentz transmission electron microscopy (TEM) revealed that is stable over much wider temperature range (100 K to ~340K) larger field our material than skyrmion-hosting bulk...
Thin Pt films on an yttrium iron garnet (YIG = Y(3)Fe(5)O(12)) show ferromagneticlike transport properties, which may impact the functionality of in spin current detection, but do not provide direct quantitative information magnetization. We report magnetic x-ray circular dichroism measurements YIG/Pt(1.5 nm) showing average moment 0.054 μ(B) at 300 K and 0.076 20 K. This observation indicates strong proximity effects induced ordering insulators their contribution to spin-related should be...
Skyrmion bags, with arbitrary topological charge Q, have recently attracted much interest, since such high-Q systems could open a way for magnetism research and are promising spintronic applications high flexibility information encoding. Investigation on room-temperature skyrmion bags in magnetic multilayered structures is essential remains unexplored so far. Here, we demonstrate creation manipulation of individual disks. Individual varying charges identified to remain stable at zero field....
The recent discovery of perpendicular magnetic anisotropy (PMA) at the CoFeB/MgO interface has accelerated development next generation high-density non-volatile memories by utilizing tunnel junctions (p-MTJs). However, insufficient interfacial PMA in typical Ta/CoFeB/MgO system will not only complicate p-MTJ optimization, but also limit device density scalability. Moreover, rapid decreases films with annealing temperature higher than 300°C make compatibility CMOS integrated circuits a big...
By systematically comparing the magnetic properties of Ta/CoFeB/Ta and MgO/CoFeB/MgO structures with without a submonolayer MgO, Ta, V, Nb, Hf W inserted in middle CoFeB layer, we have proved that observed perpendicular anisotropy (PMA) Ta/CoFeB/MgO sandwiches is solely originated from CoFeB/MgO interface Ta buffer acting to enhance significantly. Moreover, replacing causes interfacial PMA further enhanced by 35%, layer magnetization has much larger critical thickness accordingly, leaving...
Electrically switchable magnetization is considered a milestone in the development of ultralow power spintronic devices, and it has been long sought-after goal for electric-field control magnetoresistance magnetic tunnel junctions with consumption. Here, through integrating spintronics multiferroics, we investigate MgO-based on ferroelectric substrate high ratio 235%. A giant, reversible nonvolatile manipulation to about 55% realized at room temperature without assistance field. Through...
Abstract Terahertz (THz) waves show great potential in nondestructive testing, biodetection and cancer imaging. Despite recent progress THz wave near-field probes/apertures enabling raster scanning of an object’s surface, efficient, nonscanning, noninvasive, deep subdiffraction imaging technique remains challenging. Here, we demonstrate microscopy using a reconfigurable spintronic emitter array (STEA) based on the computational ghost principle. By illuminating object with STEA followed by...
The combination of exchange-biased systems and ferroelectric materials offers a simple effective way to investigate the angular dependence exchange bias using one sample with electric-field-induced competing anisotropies. A reversible electric-field-controlled magnetization reversal at zero magnetic field is also realized through optimizing anisotropy configuration, holding promising applications for ultralow power magnetoelectric devices.
Spin current generated by spin Hall effect in the heavy metal would diffuse up and down to adjacent ferromagnetic layers exert torque on their magnetization, called spin-orbit torque. Antiferromagnetically coupled trilayers, namely so-called synthetic antiferromagnets (SAF), are usually employed serve as pinned layer of spintronic devices based valves magnetic tunnel junctions reduce stray field and/or increase pinning field. Here we investigate MgO/CoFeB/Ta/CoFeB/MgO perpendicularly...
We demonstrate spin-orbit torque (SOT) switching of amorphous CoTb single-layer films with perpendicular magnetic anisotropy (PMA). The sustains even the film thickness is above 10 nm, where critical current density stays almost constant. Without need overcoming strong interfacial Dzyaloshinskii-Moriya interaction caused by heavy metal, a quite low assistant field \ensuremath{\sim}20 Oe sufficient to realize full switching. SOT effective decreases and undergoes sign change decrease Tb...
The magnetic and magnetotransport properties of the perovskite La0.67Ca0.33Mn0.9Fe0.1O3 have been investigated, spin-glass behavior with a spin freezing temperature 42 K has well confirmed for this compound. A metal-to-insulator transition colossal magnetoresistance observed near its temperature; besides, insulator found to reappear at lower temperature. formation ferromagnetic antiferromagnetic clusters competition between them introduction Fe3+ ions, which do not participate in...
We report a new magnetoresistance (MR) effect observed in nominally nonmagnetic metal (Pt) thin film contact with either ferromagnetic insulator or metal. The resistivities in-plane magnetic fields parallel (${\ensuremath{\rho}}_{\ensuremath{\parallel}}$) and transverse (${\ensuremath{\rho}}_{\mathrm{T}}$) to current perpendicular field (${\ensuremath{\rho}}_{\ensuremath{\perp}}$) show the behavior of ${\ensuremath{\rho}}_{\ensuremath{\perp}}$ \ensuremath{\approx}...
Abstract The cross‐coupling between electric polarization and magnetization in multiferroic materials provides a great potential for creating next‐generation memory devices. Current studies on magnetoelectric (ME) applications mainly focus ferromagnetic/ferroelectric heterostructures because single‐phase multiferroics with strong coupling at room temperature are still very rare. Here type of nonvolatile device is presented solely based hexaferrite Sr 3 Co 2 Fe 24 O 41 which exhibits...
Magnetic skyrmions, particular those without the support of external magnetic fields over a wide temperature region, are promising as alternative spintronic units to overcome fundamental size limitation conventional bits. In this study, we use in situ Lorentz microscope directly demonstrate generation and sustainability robust biskyrmion lattice at zero field range 16-338 K MnNiGa alloy. This procedure includes simple field-cooling manipulation from 360 (higher than Curie TC ∼ 350 K), where...
Abstract Spintronic terahertz (THz) emitter provides the advantages such as apparently broader spectrum, significantly lower cost, and more flexibility compared with commercial THz emitters, thus attracts great interest recently. In past few years, efforts have been made in optimizing material composition structure geometry, conversion efficiency has improved close to that of ZnTe crystal. One drawbacks current designs is rather limited laser absorption—more than 50% energy wasted limited....
The promise of topologically vortex-like magnetic spin textures hinges on the intriguing physical properties and theories in fundamental research their distinguished roles as high-efficiency information units future spintronics. exploration such states with unique configurations has never ceased. In this study, emergence unconventional (anti)meron chains from a domain wall pair is directly observed at zero field 2D ferromagnetic Fe5-x GeTe2 , closely correlated significant enhancement...
Taking advantage of the electron-current ability to generate, stabilize, and manipulate skyrmions prompts application skyrmion multilayers in room-temperature spintronic devices. In this study, robust high-density are electromagnetically generated from Pt/Co/Ta using Lorentz transmission electron microscopy. The density is tunable can be significantly enhanced. Remarkably, these after optimized manipulation sustain at zero field with both in-plane current perpendicular magnetic being...
Topological spin textures with versatile configurations exhibit fascinating physical behavior as high-efficiency information units. Recent observations of nontrivial in two-dimensional (2D) van der Waals (vdW) ferromagnets have shed light on their functionality a paradigm for spintronic devices. Here, the configuration single-crystal 2D vdW ${\mathrm{Fe}}_{5\text{\ensuremath{-}}x}\mathrm{Ge}{\mathrm{Te}}_{2}$ is investigated by Lorentz transmission electron microscopy, where conversion from...
Ultrasensitive anomalous Hall effect has been demonstrated in a SiO2/Fe-Pt/SiO2 sandwich structure. Owing to the interfacial electron scattering, resistivity is appreciably enhanced for thin Fe-Pt layers of high quality; meanwhile, large anisotropy formed and further through annealing, leading room temperature slope up 2160 μΩ cm/T field sensitivity 12 000 Ω/T at thickness ∼1.8 nm. This number an order magnitude higher than best semiconductor sensitivity. Other important technical...
$AB{\mathrm{O}}_{3}$ perovskite is a kind of very important functional material with versatile physical properties. Although $B$-site chemical substitution various magnetic ions has been widely investigated, the $A$-site doping transition metal little known. Here we report $A{A}_{3}^{\ensuremath{'}}{B}_{2}{B}_{2}^{\ensuremath{'}}{\mathrm{O}}_{12}$-type $A$- and ordered ferrimagnet $\mathrm{CaC}{\mathrm{u}}_{3}\mathrm{F}{\mathrm{e}}_{2}\mathrm{O}{\mathrm{s}}_{2}{\mathrm{O}}_{12}$ metals...
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...
Magnetic skyrmions in multilayers are particularly appealing as next generation memory devices due to their topological compact size, the robustness against external perturbations, capability of electrical driving and detection, compatibility with existing spintronic technologies. To date, N\'eel-type at room temperature (RT) have been studied mostly easy-axis magnetic anisotropy. Here, we systematically broadened evolution sub-50-nm size a series Pt/Co/Ta where anisotropy is tuned...
The study of topology in quantum materials has fundamentally advanced the understanding condensed matter physics and potential applications next-generation information technology. Recently, discovery a topological Chern phase spin-orbit-coupled Kagome lattice TbMn6 Sn6 attracted considerable interest. Whereas these phenomena highlight contribution momentum space Berry curvature gap on electronic transport properties, less is known about intrinsic real magnetic texture, which crucial for...