A5035647402- Magnetic properties of thin films
- Magnetic Properties and Applications
- Magnetic Properties of Alloys
- Magnetic and transport properties of perovskites and related materials
- Advanced Memory and Neural Computing
- ZnO doping and properties
- Copper Interconnects and Reliability
- Metallic Glasses and Amorphous Alloys
- Semiconductor materials and devices
- Theoretical and Computational Physics
- Solid State Laser Technologies
- Photorefractive and Nonlinear Optics
- Advanced Condensed Matter Physics
- Adsorption and biosorption for pollutant removal
- Advanced Fiber Laser Technologies
- Characterization and Applications of Magnetic Nanoparticles
- Ferroelectric and Negative Capacitance Devices
- Electronic and Structural Properties of Oxides
- Multiferroics and related materials
- Analytical chemistry methods development
- Physics of Superconductivity and Magnetism
- Carbon and Quantum Dots Applications
- Rare-earth and actinide compounds
- Diffusion and Search Dynamics
- Electrodeposition and Electroless Coatings
Beijing Technology and Business University
2015-2025
Lanzhou Jiaotong University
2021-2023
University of Chinese Academy of Sciences
2022
Chinese Academy of Sciences
2000-2022
Ningbo Institute of Industrial Technology
2022
University of Utah
2022
Lanzhou City University
2021
University of Science and Technology Beijing
2003-2016
Tianjin Hospital
2012
Institute of Physics
2001
Abstract Current induced magnetization switching by spin-orbit torques offers an energy-efficient means of writing information in heavy metal/ferromagnet (FM) multilayer systems. The relative contributions field-like and damping-like to the electrical current are still under debate. Here, we describe a device based on symmetric Pt/FM/Pt structure, which demonstrate strong torque from spin Hall effect unmeasurable Rashba effect. effective fields due were investigated quantitatively found be...
FePt/Au multilayers were deposited on preheated 100 °C MgO (001) single crystal substrates by magnetron sputtering. Magnetic properties and microstructure of the films studied. Results show that film possesses high coercivity HC, excellent perpendicular magnetic anisotropy (PMA), weak interparticle exchange coupling (IEC) after annealing. FePt Au can grow epitaxially along [001] direction, leading to PMA. atoms partly diffuse boundaries phases function as grain refiners particle isolators,...
The high-entropy concept has been recently proposed to be a promising paradigm enhance the magnetocaloric properties of materials. Motivated by this, magnetic and performance two perovskites (Dy1/4Ho1/4Er1/4Tb1/4)FeO3 (Gd1/5Dy1/5Ho1/5Er1/5Tb1/5)FeO3 have investigated. measurements indicate that spin-glass phase occurs at low temperatures in compounds, which is induced strong compositional disorder rare-earth sublattice. glassy state can lead sluggish transition consequently potential...
The construction of irradiation-tolerant anisotropic magnetoresistance (AMR) sensors is crucial for weak-field detection in scenarios aerospace and radiotherapy. Presently, the utilization NiFe/oxide composite structure was considered to be an effective scheme optimize spin-dependent transport property; however, it exhibited poor anti-irradiation ability due crystal instability oxide. Here, a strategy proposed break through limitation based on electronic reconstruction structural...
Abstract Manipulation of the antiferromagnetic moment in antiferromagnets (AFMs) is a crucial issue for developing AFM‐based spintronic devices. Lattice strain an effective strategy to modulate and traditionally based on direct crystalline tailoring AFMs. A novel method tuning by controlling exchange spring AFM, which applicable other conventional AFM materials, reported. Specifically, TiNi(Nb) shape memory alloy (SMA) used as substrate Ta/NiFe/FeMn multilayers. By thermally driven inverse...
We have studied L10-FePt thin films with a Bi underlayer. Experimental results show that the ordering temperature of film can be lowered down to 300–350°C and in-plane coercivity HC is obviously enhanced by introduction After annealing at 400°C for 20min, Bi∕FePt realizes 13.5kOe ratio remnant magnetization Mr saturation one MS as high 0.93. The reduction magnetic properties understood considering large diffusivities Fe Pt associated diffusion.
Abstract Spin orbit torque (SOT) devices with the advantages of high speed, low power consumption, and stability have wide application prospects in field spintronics. The SOT‐based crossbar array device is an important extension SOT devices, but it not reported so far. Here, all electrical magnetization switching Hall crossings based on realized. Through analyzing current distribution micromagnetic simulations, found that this field‐free comes from asymmetric density gradient at...
Probabilistic bits (p-bits) with thermal- and spin torque-induced nondeterministic magnetization switching are promising candidates for performing probabilistic computing. Previously reported torque p-bits include volatile low-energy barrier nanomagnets (LBNMs) spontaneously fluctuating magnetizations initialization-necessary nonvolatile magnets. However, initialization-free still lacking. Here, we demonstrate moderately thermal stable spin-orbit (SOT) non-consecutively deposited...
We have prepared L10-FePt∕BN nanocomposite films by depositing the FePt∕BN mutilayers on MgO(100) substrates using magnetron sputtering followed a postannealing process. found excellent perpendicular magnetic anisotropy of [FePt(2nm)∕BN(0.5nm)]10 film after annealing at 700°C for 1h x-ray diffraction patterns also indicate an (001) texture film. This shows coercivity 7.48kOe and ratio remnant magnetization Mr to saturation one MS as high 0.93. good epitaxial growth FePt grains substrate...
Powder mixtures of SmxCo5 (x=0.65–1.3)+20 wt % α-Fe were mechanically milled. Annealing these as-milled powders results in the formation a mixture hard phase Sm–(Co, Fe) and soft Fe–Co. For Sm1Co5+20 powder, changes with increase annealing temperatures. The optimal maximum energy product (BH)max is obtained powder annealed at 550 °C for 30 min. Depending on Sm content powders, phases can be 1:7, 1:5, or 2:7 after heat treatment coercivity 6.5 kOe 17.8 MGOe achieved x=1.0. highest 9.67 x=1.2....
We have prepared L10-FePt films by sputtering FePt∕Au mutilayers on glass substrates followed a vacuum annealing process. The magnetic measurement and x-ray diffraction indicate that the ordering temperature of FePt is reduced to 350°C coercivity (HC) greatly enhanced using multilayer structure. interface energy stress due misfit between Au crystal lattices provide extra driving force process films. Additionally, partial atoms are supposed diffuse grain boundaries during annealing, which...
FePt and FePtCu thin films with a fixed thickness of 50 nm have been prepared by magnetron sputtering. The atomic ratio Fe to Pt atoms was accurately controlled dc co-sputtering. After vacuum annealing for 20 min at 350 °C, coercive force about 605 kA m−1 is obtained in the Fe52Pt48 an ordering parameter around 0.87. L10 phase not enhanced addition Cu films. On contrary, process improved Pt-rich or stoichiometric To keep low temperature, lower content, more needed. It found that can be after...
Realizing fast L10 ordering phase transition (LOPT) in structured magnetic materials without heat treatment is crucial for their applications spintronic devices. This article reports on the electromigration controlled momentum transfer and rapid of Fe Pt atoms as-deposited FePt films. Lattice defects films provide enough diffusion pathways allow rearranging. Through current driven atomic motion rearrangement, LOPT can result establishment perpendicular anisotropy at room temperature. effect...
Tailoring magnetic anisotropy of ferromagnetic films is a critical issue in constructing energy-efficient and high-density memory devices. Presently, the effective tunability was focused on single-ion-manipulated electronic structure evolution. Here, we reported new strategy dual-ion-tuned orbital films. N-doped Fe/MgO bilayer were deposited shape alloy substrates which can generate significant lattice strain Before N ions participate into manipulation, film shows an in-plane anisotropy, may...
The anomalous temperature dependence of coercicity, Hc(T), has been observed in precipitation hardened PrCo6.7−xCuxTi0.3 (x=0.2–1) magnets. Transmission electron microscopy reveals that they exhibit a cellular microstructure. With an increase Cu content, the Curie 2:17 phase remains nearly unchanged whereas 1:5 decreases. peak Hc(T) becomes higher, broader and shifts towards low while room coercivity does not change with content. There is strong correlation between Hc(T). effect on cannot be...
This study aimed to develop a novel magnetic chitosan/dopamine/Fe3O4 nano-adsorber (CS@PDA@Fe3O4) for the removal of heavy metal ions and organic dye molecules from aqueous solution. CS@PDA@Fe3O4 was prepared by surface modification PDA/Fe3O4 nanoparticles with chitosan using IPTES as cross-linker. The structure, composition, properties were characterized elemental (EDS), spectroscopic (XRD, XPS, FT-IR), intensity (VSM), morphological (TEM SEM) analyses. In order its adsorption behavior,...