A5037413089- Magnetic properties of thin films
- Magnetic Properties and Applications
- Metallic Glasses and Amorphous Alloys
- Topological Materials and Phenomena
- Quantum and electron transport phenomena
- Magnetic Properties and Synthesis of Ferrites
- Iron oxide chemistry and applications
- 2D Materials and Applications
- Electronic and Structural Properties of Oxides
- Physics of Superconductivity and Magnetism
- Magnetic Properties of Alloys
- Atomic and Subatomic Physics Research
- Magnetic and transport properties of perovskites and related materials
- Plant Surface Properties and Treatments
- Ferroelectric and Negative Capacitance Devices
- Plant responses to water stress
- Advanced Condensed Matter Physics
- Advanced Frequency and Time Standards
- Characterization and Applications of Magnetic Nanoparticles
- Advanced MRI Techniques and Applications
- Quantum optics and atomic interactions
- Magneto-Optical Properties and Applications
- Electromagnetic wave absorption materials
- Multiferroics and related materials
- ZnO doping and properties
National University of Defense Technology
2017-2019
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2015-2018
CEA Grenoble
2015-2018
Spintronique et Technologie des Composants
2017-2018
Institut Nanosciences et Cryogénie
2015-2016
Université Grenoble Alpes
2015-2016
Southeast University
2007-2014
University of Duisburg-Essen
2014
Collaborative Innovation Center of Advanced Microstructures
2009
Nanjing University
2009
We present experimental results on the conversion of a spin current into charge by pumping Dirac cone with helical polarization elemental topological insulator (TI) {\alpha}-Sn[1-3]. By angle-resolved photoelectron spectroscopy (ARPES) we first confirm that at surface {\alpha}-Sn (0 0 1) layers subsists after covering Ag. Then show resonant room temperature from Fe through Ag induces lateral can be ascribed to Inverse Edelstein Effect[4-5]. Our observation an Effect length[5-6] much longer...
For spintronics application, which requires fast field switching, it is important to have a kind of soft magnetic material with large damping coefficient. Here, we present the studies Nd dopant-level-dependent coefficient Nd${}_{x}$-Py${}_{(1\ensuremath{-}x)}$ thin films (30 nm) in dilute region utilizing ferromagnetic resonance (FMR). With content increasing, film structure was found be changing from polycrystalline amorphous when around 3.4%. Meanwhile, magnetization decreases linearly....
We present measurements of the spin Hall effect (SHE) in AuW and AuTa alloys for a large range W or Ta concentrations by combining experiments on lateral valves ferromagnetic-resonance/spin-pumping techniques. The main result is identification enhancement angle (SHA) side-jump mechanism impurities, with SHA as high $+0.5$ (i.e., $50%$) about 10% Ta. In contrast, does not exceed $+0.15$ can be explained intrinsic SHE alloy without significant extrinsic contribution from skew scattering...
A series of Fe3O4 particle chains with an average diameter 150 nm and different lengths were synthesized by using the self-assembly method at reduced temperature in synthesizing magnetic fields. The influence field on properties magnetite was studied structural analyses, magnetometry measurement, ferromagnetic resonance. uniaxial anisotropy saturation (Hs), hysteresis loop, resonance observed to increase increasing field. magnetization g-factor found slightly demagnetizing fields factors...
GeTe has been predicted to be the father compound of a new class multifunctional materials, ferroelectric Rashba semiconductors, displaying coupling between spin-dependent k-splitting and ferroelectricity. In this paper, we report on epitaxial Fe/GeTe(111) heterostructures grown by molecular beam epitaxy. Spin-pumping experiments have performed in radio-frequency cavity pumping spin current from Fe layer into at ferromagnetic resonance detecting transverse charge originated slab due...
We report the observation of spin-to-charge current conversion in strained mercury telluride at room temperature, using spin pumping experiments. show that a HgCdTe barrier can be used to protect HgTe from direct contact with ferromagnet, leading very high rates, inverse Edelstein lengths up $2.0\ifmmode\pm\else\textpm\fi{}0.5\text{ }\text{ }\mathrm{nm}$. The influence layer thickness on efficiency is found differ strongly what expected Hall effect systems. These measurements, associated...
(Ni <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">83</sub> Fe xmlns:xlink="http://www.w3.org/1999/xlink">17</sub> ) xmlns:xlink="http://www.w3.org/1999/xlink">1-x</sub> -Gd xmlns:xlink="http://www.w3.org/1999/xlink">x</sub> thin films (30 nm) are deposited by sputtering at room temperature and studied using X-ray diffraction, vibrating sample magnetometer, ferromagnetic resonance (FMR). The film structure changes from polycrystalline to...
The knowledge of the spin diffusion length, ${\ensuremath{\lambda}}_{A}$, is a prerequisite for estimation Hall angle given materials. We investigate spin-current absorption materials with short ${\ensuremath{\lambda}}_{A}$ using AuW stripes inserted in Cu-based lateral valves. Width variations stripe lead to drastic changes which cannot be explained by conventional analysis. show that polarization and spin-accumulation attenuation Cu vicinity absorber must precisely taken into account an...
Magnetic anisotropies of single crystal ultrathin Fe3O4 films on GaAs(100) have been studied by ferromagnetic resonance (FMR). The dependence the FMR fields field orientation was measured both in plane and out plane. show predominantly an in-plane uniaxial magnetic anisotropy with easy axis along [0−11] direction GaAs substrate. constant decreases increasing thickness changes from 7.1×104to2.1×104ergs∕cm3 when tFe varies 4to8nm. An fourfold due to cubic magnetocrystalline coexists increases...
Magnetic anisotropies of Fe/MgO/GaAs(100) hybrid structure with two different nonmagnetic capping materials, Au and MgO have been studied by ferromagnetic resonance (FMR). A uniaxial anisotropy, unexpected from the crystal was observed in ultrathin films for both materials. Its global easy axis is along [0-11] direction while (010) directions are equally magnetic hard regardless overlayer material. The in-plane anisotropy (in-plane cubic anisotropy) capped samples stronger (weaker) than that...
Reducing the transverse relaxation rate of alkali atoms is crucial to improve sensitivity magnetometers. In a perturbative treatment effects magnetic-field gradients, rates are predicted be proportional square longitudinal gradient. The theoretical predictions confirmed in our experiments. gradients vapor cell measured by gradient suppressed drastically through compensating it with compensation coils. Experimental results show that suppressing can reduce significantly. This study contributes...
The magnetic-resonance lines of alkali atoms are broadened considerably by the spin-exchange collisions for a radio-frequency magnetometer operating at high temperature. resonance linewidths cesium derived solving relaxation equations. When dominates, light narrowing effect is predicted. For atomic operates temperature, remarkable observed increasing pump power. Cs-Cs partially suppressed narrowing. This study helps to expand applications magnetometers in high-sensitivity magnetic-field detection.
(Fe50Co50)(1-x)-Gdx thin films (30 nm) with x<15% deposited on silicon substrates by magnetron sputtering were investigated X-ray diffraction, vibrating sample magnetometer, and ferromagnetic resonance. Theoretical fittings of the angular dependent resonance field FeCoGd have been performed using Landau-Lifshitz equation It is found that experimental data well fitted theory various magnetic properties extracted in accordance. The saturation magnetization decreases from 22750 Oe at x = 0% to...
a-Fe2O3 nanowire was successfully synthesized by oxidation of pure iron. The as-synthesized arrayed normal to the surface substrate, were perfect single crystals with diameters 20 40 nm and lengths varying from 2 5 µm. magnetic property nanowires studied, some interesting phenomena observed. moment shows an antiferromagnetic behavior at high temperature a weakly ferromagnetic low temperature. block found be significantly higher than that nanoparticle.
The effect of doping rare earth (RE) element on the structure and magnetic properties thin films transition metal (TM) alloys is an interesting topic though RE-TM have been well studied as permanent magnet magnetooptical recording media. In this paper, we investigated diluted Gd Fe <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">50</inf> Co by Vibrating Sample Magnetometer (VSM) Ferromagnetic Resonance (FMR). Gilbert damping coefficient...
The knowledge of the spin diffusion length $λ_{A}$ is a prerequisite for estimation Hall angle. We investigate current absorption materials with small using AuW stripes inserted in lateral spin-valves. Width variations stripe lead to drastic changes absorption, which cannot be explained by conventional analysis. show that spin-current polarization and accumulation attenuation vicinity absorber must precisely taken into account accurate $λ_{A}$. propose an analytical model supported numerical...