Guang Yang

Ultrahigh Anomalous Hall Sensitivity in Co/Pt Multilayers by Interfacial Modification

A large enhancement of anomalous Hall sensitivity (S-v) by metal/oxide interfacial modification is obtained in a MgO/[Co/Pt](3)/MgO multilayered structure. The values of S-v are increased to 8363 V/A.T by CoO insertion and 2261 V/A.T by Pt insertion, while S-v is approximately 1000 V/A.T in normal Hall semiconductor sensors. Microstructural analysis shows that the crystal orientation of [Co/Pt](3) multilayers is improved, and the oxygen concentration is largely changed by introducing an ultrathin CoO layer at metal/oxide interfaces, leading to a large increment of S-v

Large third-order optical nonlinearity in BaTiO3 matrix-embedded metal nanoparticles

Abstract Composite films consisting of nanoscale Au particles uniformly embedded in barium titanate (BaTiO 3 ) matrices (Au:BaTiO 3 ) were prepared by alternate ablation of metallic Au and ceramic BaTiO 3 targets using pulsed laser deposition (PLD) technique. Average diameters of the Au particles were in the range of 2–3xa0nm. The third-order optical nonlinearity of the composite films was investigated using the z -scan method at the wavelength of 532xa0nm with a laser duration of 10xa0ns. The nonlinear refractive index n 2 and the nonlinear absorption coefficient β (m/W) were determined to be −2.42×10 −6 xa0esu and 2.22×10 −6 xa0m/W, respectively.

Nonlinear refraction and saturable absorption in Au:BaTiO 3 composite films

Composite thin films Au:BaTiO3, comprising nanometer-sized gold particles embedded in barium titanate matrices, were synthesized on MgO (100) substrates with the pulsed laser deposition technique. The nanostructure of the films and the size distributions of the Au particles were analyzed by high-resolution transmission electron microscopy. Crystal lattice fringes from the Au nanocrystals and the BaTiO3 matrices were observed. The nonlinear optical properties of the Au:BaTiO3 films were measured with the z-scan method at a wavelength of 532 nm, which was closed to the surface plasmon resonance of nanoscale Au particles. The features of the closed-aperture z-scan transmittance curves were affected by the ratio, which increased greatly at a high metal concentration, of the imaginary part to the real part of the third-order nonlinear susceptibility chi(3).

Spatially resolved gap closing in single Josephson junctions constructed on Bi2Te3 surface

On the road of searching for Majorana fermions in condensed matter systems, a highly-sought signature is full gap-closing, as a condition for hosting the Majorana zero modes, in Josephson devices constructed on the surface of topological insulators. In this Letter, we present direct experimental evidence of gap-closing in single Josephson junctions constructed on Bi

Anomalous magnetic moments as evidence of chiral superconductivity in a Bi/Ni bilayer

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The temperature dependence of the low field magnetoresistance in electron-doped manganites: La1?xTexMnO3?(x = 0.04,0.1)

Te

Interplay of Rashba effect and spin Hall effect in perpendicular Pt/Co/MgO magnetic multilayers*

_3

The inherent optical nonlinearities of thin silver films

surface via local contact-resistance measurement.

Oriented-assembly of hollow FePt nanochains with tunable catalytic and magnetic properties

Junhua Wang, ∗ Xinxin Gong, ∗ Guang Yang, Zhaozheng Lyu, Yuan Pang, Guangtong Liu, Zhongqing Ji, Jie Fan, Xiunian Jing, 3 Changli Yang, 3 Fanming Qu, Xiaofeng Jin, † and Li Lu 3, 4, † Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People’s Republic of China State Key Laboratory of Surface Physics and Department of Physics, Fudan University, Shanghai 200433, People’s Republic of China Collaborative Innovation Center of Quantum Matter, Beijing 100871, People’s Republic of China School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100190, People’s Republic of China (Dated: March 21, 2018)

Extension of the Hapke bidirectional reflectance model to retrieve soil water content

The low field magnetoresistance (LFMR) effect for an electron-doped manganese oxide: La1-xTexMnO3 (x = 0.04, 0.1) was investigated over the whole experimental temperature range of 5-300 K. A large LFMR of the samples was observed when the temperature was far above the Curie temperature and when it was far below the metal-insulator transition temperature. The experimental results-electron spin resonance spectra and the magnetic field dependence of the resistivity-suggested that the spin-polarized tunnelling between isolated ferromagnetic metallic clusters should be mainly responsible for generating the larger LFMR.