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Spontaneous positive exchange bias effect in SrFeO_(3-x)/SrCoO_(3-x) epitaxial bilayer

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Rare Metals 2021年第7期40卷 1858-1864页

作者： Tian-Cong Su Jun Zhang Wei Zhang Ying-Ying Wang Hui-Hui Ji Xiao-Jiao Wang Guo-Wei Zhou Zhi-Yong Quan Xiao-Hong Xu School of Chemistry and Materials Science Shanxi Normal UniversityLinfen 041004China Department of Chemistry and Chemical Engineering Lvliang UniversityLvliang 033001China Key Laboratory of Magnetic Molecules and Magnetic Information Materials of Ministry of Education Linfen 041004China Research Institute of Materials Science Shanxi Normal UniversityLinfen 041004China Collaborative Innovation Center for Shanxi Advanced Permanent Magnetic Materials and Techonology Linfen 041004China

A novel phenomenon of spontaneous positive exchange bias(PEB)is reported in SrFeO_(3-x)/SrCoO_(3-x) epitaxial bilayer without undergoing any magnetic field *** inserting a thick SrTiO3(STO)nonmagnetic spacer(about 6 nm)into the bilayer interface,this phenomenon still *** on a series of testing means,the spontaneous PEB effect is supposed to be mainly related to short-range ferromagnetic(FM)exchange coupling at the interface when there is no STO *** the STO interlayer reaches up to a certain thickness,shortrange coupling interaction basically *** this time,the long-range dipole field may be responsible for the coupling of the FM and antiferromagnetic(AFM)layer across the nonmagnetic STO and then leads to the same bias *** discoveries provide a new way to realize and manipulate spontaneous exchange bias-based spintronics devices,such as magnetic recording heads and spin valves.

关键词： SrFeO_(3-x)/SrCoO_(3-x)bilayer Spontaneous positive exchange bias Long-range dipole field Exchange coupling

Structures and properties of [CoPt/Ag]_(n) multilayer films

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Science China(Technological Sciences) 2005年第2期48卷 214-219页

作者： XU Xiaohong YANG Zhiguang WU Haishun School of Chemistry and Material Science Shanxi Normal University Linfen 041004 China School of Chemistry and Material Science Shanxi Normal University Linfen 041004 China School of Chemistry and Material Science Shanxi Normal University Linfen 041004 China

The magnetic properties and structures of [CoPt/Ag]n multilayer films deposited by DC magnetron sputtering have been studied. During the deposited process, two kinds of deposited sequences, that is Ag layer (FDAG) first deposited or CoPt layer (FDCP) first deposited, have been chosen. The results show that the microstructures and coercivities were strongly influenced by the deposited sequence and the thickness of films. The coercivities of [Ag/CoPt]n with FDAG are obviously higher than those of [CoPt/Ag]n with FDCP. Especially, when the thickness of films is 8 nm, the difference of coercivities between the FDAG film and the FDCP film is the largest. It is possibly because Ag plays a role of underlayer in FDAG multilayers, which can induce both the transformation from fcc to fct and the oriented growth along c-axis. In addition, δ M curves reveal that the [CoPt/Ag]8 multilayer film has a lower intergrain interaction than the CoPt/Ag bilayer film.

关键词： [CoPt/Ag]n multilayer films, deposition sequence, magnetic properties, X-ray diffraction.

Theoretical Exploration of the Isotopic Effect on Nuclear Dynamics in Coulomb Explosion

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Chinese Physics Letters 2013年第6期30卷 80-84页

作者： SHI Hao-Ting MIAO Xiang-Yang College of Physics and Information Engineering Shanxi Normal UniversityLinfen 041004

The isotopic effect on nuclear dynamics in Coulomb explosion for various initial vibrational states of H_(2)^(+) and HD+in intense laser(80 fs,800 nm,I=6.8×10^(13)W/cm^(2)) is theoretically investigated by numerically solving the time-dependent Schrodinger *** calculated results confirm that the effect we discussed by paying close attention to the comparative analysis of peak locations in the nuclear kinetic-energy-release spectra largely depends on the selection of the initial vibrational ***,it is the special isotope effect case about the vibrational state v=5 that has been studied in *** also discuss the time-dependent spectrum atυ=7,which can reveal the difference in nuclear wavepacket motion between H_(2)^(+) and HD+in the time region in which charge-resonance enhanced ionization takes place.

关键词： equation. vibrational intense

Selection of right-circular-polarized harmonics from p orbital of neon atom by two-color bicircular laser fields

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Chinese Physics B 2019年第10期28卷 315-320页

作者： Chang-Long Xia Yue-Yue Lan Qian-Qian Li Xiang-Yang Miao College of Physics and Information Engineering Shanxi Normal UniversityLinfen 041004China Key Laboratory of Spectral Measurement and Analysis of Shanxi Province Shanxi Normal UniversityLinfen 041004China

The polarization properties of high-order harmonic generation(HHG) in the two-color circularly polarized laser fields are investigated by numerically solving the two-dimensional time-dependent Schr?dinger equation. By adding a wavelength of 1600-nm right-circular-polarized field to an 800-nm left-circular-polarized field, HHG is simulated from a real model of neon atom with p orbital, but not from a hydrogen-like atom model with s orbital. The orders of 3n + 1 can be selected while the orders of 3n + 2 are suppressed by adjusting the intensities of the two pulses. The physical mechanism is analyzed by time-frequency analysis and semiclassical model.

关键词： high-order harmonic generation circular polarization field polarization selection

Quantum quenches in the Dicke model:Thermalization and failure of the generalized Gibbs ensemble

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Chinese Physics B 2020年第12期29卷 198-204页

作者： Xiao-Qiang Su You-Quan Zhao College of Physics and Information Engineering ShanXi Normal UniversityLinfen 041004China

Quantum quenches in the Dicke model were studied both in the thermodynamic limit and the finite *** the integrable situation in the thermodynamic limit,the generalized Gibbs ensemble can effectively describe the energylevel occupations for the quench within the normal phase,but it fails for the quench to the superradiant *** the finite systems which are considered non-integrable,the post quench systems were studied by comparing with the thermal *** canonical ensembles are directly available for the quench within the normal *** the increasing of the target coupling strength over the equilibrium phase transition critical point,sudden changes take place for the effective temperature and the distance to the thermal *** thermalization was also studied by comparing with the results of the microcanonical ensembles.

关键词： quantum quench generalized Gibbs ensemble thermalization Dicke model

Effect of Carrier Envelope Phase on High-Order Harmonic Generation from Solid

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Chinese Physics Letters 2019年第5期36卷 35-39页

作者： Jie Shao Cai-Ping Zhang Jing-Chao Jia Jun-Lin Ma Xiang-Yang Miao College of Physics and Information Engineering Shanxi Normal UniversityLinfen 041004 Key Laboratory of Spectral Measurement and Analysis of Shanxi Province Shanxi Normal UniversityLinfen 041004

The dependence of harmonic emission from a solid on the carrier envelope phase (CEP) is discussed by numerically solving the time-dependent Schr?dinger equation. The harmonic spectra periodically exhibit three distinct oscillating structures, which indicate the different dependences of the cutoff energies on the CEP. Furthermore,with time-dependent population imaging and the populations of different energy bands, the underlying physical mechanism is explored.

关键词： CEP Effect of Carrier Envelope Phase on High-Order Harmonic Generation from Solid CB

K-POTENT PRESERVING LINEAR MAPS

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Acta Mathematica Scientia 2002年第4期22卷 517-525页

作者：侯绳照侯晋川 Department of Mathematics Shanxi Teachers University Linfen 041004 China

Let B(X) be the Banach algebra of all bounded linear operators on a complex Banach space X. Let k greater than or equal to 2 be an integer and phi a weakly continuous linear surjective map from B(X) into itself. It is shown that phi is k-potent preserving if and only if it is k-th-power preserving, and in turn, if and only if it is either an automorphism or an antiautomorphism on B(X) multiplied by a complex number lambda satisfying lambda(k-1) = 1. Let A be a von Neumann algebra and B be a Banach algebra, it is also shown that a bounded surjective linear map from A onto B is k-potent preserving if and only if it is a Jordan homomorphism multiplied by an invertible element with (k - 1)-th power I.

关键词： Banach space operator k-potent operator automorphism

Quantum Discord Behavior about Two-Qubit Heisenberg XYZ Model with Decoherence

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Chinese Physics Letters 2014年第3期31卷 18-22页

作者： SONG Le YANG Guo-Hui School of Physics and Information Engineering Shanxi Normal University Linfen 041004

We investigate the properties of quantum discord dynamics of a two-qubit Heisenberg XYZ system which is influenced by the environmental decoherence under an external nonuniform magnetic field. It shows that the influence of the parameters on the system heavily rely on the selection of the initial states. One point shows that the environmental decoherence cannot entirely destroy the quantum correlation, and properly controlling the parameters can inhibit the decoherence. Moreover, it presents that the inhomogeneous magnetic field cannot affect the steady quantum discord （QD）, while the uniform magnetic field and the anisotropy coupling constant will change the steady QD. These investigations imply that one can obtain larger steady QD values by reasonably adjusting parameters on quantum correlation in solid state systems.

关键词： Magnetic fields

Photoelectron momentum distributions of single-photon ionization under a pair of elliptically polarized attosecond laser pulses

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Chinese Physics B 2020年第7期29卷 313-320页

作者： Hui-Fang Cui Xiang-Yang Miao College of Physics and Information Engineering Shanxi Normal UniversityLinfen 041004China Key Laboratory of Spectral Measurement and Analysis of Shanxi Province Shanxi Normal UniversityLinfen 041004China

The attosecond ionization dynamics of atoms has attracted extensive attention in these ***,the role of the initial state is not clearly *** address this question,we perform simulations on the neon atom and its model atom with different initial states by numerically solving the corresponding two-dimensional time-dependent Schrodinger¨*** theoretically investigate atomic photoelectron momentum distributions(PMDs)by a pair of elliptically polarized attosecond laser *** find that the PMD is sensitive not only to the ellipticities of the pulses,the relative helicity,and time delay of the pulses,but also to the symmetry of the initial electronic *** are analyzed by the first-order time-dependent perturbation theory(TDPT)and offer a new tool for detecting the rotation direction of the ring currents.

关键词： photoelectron momentum distributions elliptically polarized attosecond laser pulses magnetic quantum numbers rotation direction of the ring currents