A5053186267- Magnetic properties of thin films
- Quantum and electron transport phenomena
- Physics of Superconductivity and Magnetism
- Advanced Memory and Neural Computing
- Semiconductor materials and devices
- Magnetic and transport properties of perovskites and related materials
- Theoretical and Computational Physics
- Heusler alloys: electronic and magnetic properties
- 2D Materials and Applications
- Magnetic Properties and Applications
- Topological Materials and Phenomena
- Copper Interconnects and Reliability
- ZnO doping and properties
- Magnetic Properties of Alloys
- Electrodeposition and Electroless Coatings
- Advanced MRI Techniques and Applications
- Graphene research and applications
- Laser-Matter Interactions and Applications
- Advancements in Semiconductor Devices and Circuit Design
- Rare-earth and actinide compounds
- Molecular Junctions and Nanostructures
- Advanced Thermoelectric Materials and Devices
- Atomic and Subatomic Physics Research
- Magnetism in coordination complexes
- Electron Spin Resonance Studies
Beijing Information Science & Technology University
2024-2025
Johns Hopkins University
2000-2024
Georgia Institute of Technology
2024
Sun Yat-sen University
2022-2024
Sichuan University
2024
Geely (China)
2024
Dalian National Laboratory for Clean Energy
2024
Collaborative Innovation Center of Chemistry for Energy Materials
2024
Dalian Institute of Chemical Physics
2024
Chinese Academy of Sciences
2024
Andreev reflection at a Pb/CrO(2) point contact has been used to determine the spin polarization of single-crystal CrO(2) films made by chemical vapor deposition. The is found be 0.96 +/- 0.01, which confirms that half-metallic ferromagnet, as theoretically predicted.
We present point-contact Andreev reflection measurements of $X/\mathrm{N}\mathrm{b}$ contacts, where $X=\mathrm{Ni},$ Co, Fe, and Cu. Experimental conductance-voltage curves were analyzed with the Blonder-Tinkham-Klapwijk theory [Phys. Rev. B 25, 4515 (1982)], extended to include polarization P metal proximity effects. For Ni, Fe can be well described by model Z as fitting parameters, is a dimensionless barrier strength included in describe elastic scattering at nonideal metal/superconductor...
We report on structural, magnetic, transport, and spin-polarization measurements of the Heusler alloys ${\mathrm{Co}}_{2}\mathrm{MnSi}$ NiMnSb. Laue diffraction patterns confirm single-crystal nature ${\mathrm{Co}}_{2}\mathrm{MnSi}.$ Room-temperature transport show a negative magnetoresistance in Point-contact Andreev reflection spin polarization yield values for NiMnSb 56% 45%, respectively. Temperature dependence resistivity reveals relatively large residual ratio...
Automatic retinal layer segmentation with medical images, such as optical coherence tomography (OCT) serves an important tool for diagnosing ophthalmic diseases. However, it is challenging to achieve accurate due low contrast and blood flow noises presented in the images. In addition, algorithm should be light-weight deployed practical clinical applications. Therefore, desired design a network high performance segmentation. this paper, we propose LightReSeg which can applied OCT...
We demonstrate the injection of spin-polarized electrons into paramagnetic Au nanowires by driving an electric current from a ferromagnetic permalloy (Py) electrode. The nonequilibrium spin accumulation in results difference between chemical potentials for spin-up and spin-down that is detected as field-dependent voltage signal using second Py magnitude contrast (>10%) its coincidence with magnetic switching electrodes attest to spin-sensitive origin signals. By increasing separation...
The development of two-dimensional (2D) magnetism is driven not only by the interest low-dimensional physics but also potential applications in high-density miniaturized spintronic devices. However, 2D materials possessing a ferromagnetic order with relatively high Curie temperature (Tc) are rare. In this paper, evidence ferromagnetism monolayer FeCl2 on Au(111) surfaces, as well interlayer antiferromagnetic coupling bilayer FeCl2, characterized using spin-polarized scanning tunneling...
We have fabricated single crystal chromium dioxide $({\mathrm{CrO}}_{2})$ films using chemical vapor deposition with chromyl chloride $({\mathrm{CrO}}_{2}{\mathrm{Cl}}_{2})$ as a liquid precursor. Their electrical and magnetic properties been investigated. These are atomically smooth rms roughness of less than 5 \AA{} for 1000 thick films. obtained spin polarization $P=98.4%,$ determined by the technique point-contact Andreev reflection. Magnetization resistivity measurements on these in...
Evidence for a current-induced spin-transfer torque effect has been investigated in series of point contacts to single ferromagnetic layers. At specific current densities, abrupt resistance changes, similar those attributed spin-wave excitations multilayers, have observed one polarity. The critical these changes depends linearly on the external field applied perpendicular layer. is interpreted as current-driven heterogeneous instability an otherwise uniform
Abstract Improper end‐of‐life treatments of C−O‐linked plastics have caused serious environmental crises and resource waste. One effective method to solve this issue is the catalytic alcoholysis these plastics. Traditional homogeneous catalysts or metal‐based heterogeneous for some drawbacks, such as difficulty in complete separation, threats, economic burden. Thus, finding a green, low‐cost, recyclable, highly efficient catalyst substitute critical. Here, we reported that polymeric carbon...
Nonlocal spin injection is demonstrated in Co∕Cu∕Co lateral valves. Measurement of a series structures with varying Cu length between the Co electrodes permits direct determination both diffusion λs and polarization P at Co∕Cu interface. The value 200±20nm 10K ⩾110nm 300K, which shorter than previously reported, due to possible presence impurities Cu. However, >7%, improved compared previous reports 2%, attributed higher interfacial quality.
Hydrodynamic ram (HRAM) phenomena, triggered by high-velocity projectiles impacting water-filled containers, induce confined cavities whose evolution is strongly influenced container constraints. This study integrates experimental data, numerical simulations using LS-DYNA’s ALE method, and theoretical models—including a model developed the authors (Ji model) both incompressible compressible cylindrical bubble models— to investigate cavity evolution. While accurately capture initial expansion...
We demonstrate spin-transfer torque effects in a single exchange-biased ferromagnetic layer. A current through point contact to the Co layer reverses magnetization of nanodomain hysteretically for low applied magnetic fields and reversibly high (up 9 T). These are inverse domain wall magnetoresistance, same way that similar multilayers giant magnetoresistance.
Injection and detection of non-local spin accumulation have been demonstrated in a series nanoscale metallic lateral valves, fabricated by electron beam lithography. A distinct feature valves is that pure current without charge flow can be generated. The measured signal only sensitive to the relative orientations detector accumulation, exhibits little background voltage. injection polarizations interfaces diffusion lengths non-magnetic components determined measuring signals from set similar...
Views Icon Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Twitter Facebook Reddit LinkedIn Tools Reprints and Permissions Cite Search Site Citation Han Zou, Yi Ji; The origin of high surface spin-flip rate in metallic nonlocal spin valves. Appl. Phys. Lett. 20 August 2012; 101 (8): 082401. https://doi.org/10.1063/1.4747215 Download citation file: Ris (Zotero) Reference Manager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Dropdown...
Interfacing topological insulators (TIs) with magnetic (MIs) has been widely used to study the interaction between surface states and magnetism. Previous transport studies typically interpret suppression of weak antilocalization or appearance anomalous Hall effect as signatures proximity (MPE) imposed TIs. Here, we report observation nonlinear planar (NPHE) in Bi2Se3 films grown on MI thulium yttrium iron garnet (TmIG YIG) substrates, which is an order magnitude larger than that nonmagnetic...
Submicron metallic lateral spin valves are fabricated with AlOx tunnel junctions as injection and detection barriers. The polarization is estimated to be ∼20%, determined by both Hanle effect variations of device dimensions. maintained at a large dc current density >2×106 A/cm2. Both the diffusion length weakly temperature dependent.
The spin polarization of single crystals ${\mathrm{La}}_{0.7}{\mathrm{Sr}}_{0.3}{\mathrm{MnO}}_{3}$ and ${\mathrm{La}}_{0.6}{\mathrm{Sr}}_{0.4}{\mathrm{MnO}}_{3}$ has been measured by point-contact Andreev reflection (PCAR) using a superconducting Pb tip. conductance vs bias voltage spectra have taken at temperatures below 2 K for different contact junction resistances. quadratic dependence upon scattering barrier strength, similar to those other ferromagnetic materials PCAR, established....
Spin accumulation generated by the anomalous Hall effect (AHE) in mesoscopic ferromagnetic $\mathrm{N}{\mathrm{i}}_{81}\mathrm{F}{\mathrm{e}}_{19}$ (permalloy, Py) films is detected electrically a nonlocal method. The reciprocal phenomenon, inverse spin (ISHE), can also be and all same structure. For accurate quantitative analysis, series of AHE/ISHE structures supplementary are fabricated on each sample substrate to account for statistical variations accurately determine essential physical...
Spin-polarized currents injected through a point-contact into continuous Co/Cu/Co trilayer film can reversibly switch the magnetization of small magnetic bits in top Co layer. The states written depend on polarity injection currents, and remain stable at room temperature. reversible writing be achieved for wide range contact resistances with well-defined voltage reversal.
Two different theoretical approaches in the determination of spin polarization by point-contact Andreev reflection are discussed and compared from an experimental perspective. Both models can be used to extract results for a variety ferromagnetic materials including half-metallic ${\mathrm{CrO}}_{2}.$ The difference values as determined two is less than 0.02.
We report a time-resolved imaging study of the influence shape on magnetic instabilities in patterned structures. find that rectangular structures magnetization reversal initiates at ends and interior simultaneously, while with tapered begins middle spreads out to ends. The degree tapering is important for both switching field time required full reversal. A model based concept local instability regions yields good agreement observed location onsets.
The spin signals in nonlocal valves with 1.3 nm ${\text{AlO}}_{x}$ layers as spin-injection and spin-detection interfaces have been measured a function of the dc bias current through injector. Increases observed both polarities injection current, magnitudes up to 81%. This is attributed redistribution due nonlinear resistivity at higher bias. baseline signal varies well, it consistent interpretation redistribution. A temperature dependence has conducted demonstrate that 81% increase cannot...