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Science China(Physics,Mechanics & Astronomy) 2023年第12期66卷 158-168页

作者： Wen-Tian Lu Zhe Yuan xiaohong xu Key Laboratory of Magnetic Molecules and Magnetic Information Materials of Ministry of Education School of Chemistry and Materials ScienceShanxi Normal UniversityTaiyuan 030032China Institute for Nanoelectronic Devices and Quantum Computing Fudan UniversityShanghai 200433China

A systematic investigation of spin injection behavior in Au/FM(FM=Fe and Ni)multilayers is performed using the superdiffusive spin transport *** exciting the nonmagnetic layer,the laser-induced hot electrons may transfer spin angular momentum into the adjacent ferromagnetic(FM)metals resulting in ultrafast demagnetization or *** find that these experimental phenomena sensitively depend on the particular interface reflectivity of hot electrons and may reconcile the different observations in the *** by the ultrafast spin currents carried by the hot electrons,we propose the multilayer structures to generate highly spin-polarized currents for the development of future ultrafast spintronics *** spin polarization of the electric currents carried by the hot electrons can be significantly enhanced by the joint effects of bulk and interfacial spin ***,the intensity of the generated spin current can be optimized by varying the number of repeated stacking units and the thickness of each metallic layer.

关键词： spintronics ultrafast magnetodynamics spin polarization transport magnetic multilayer

(001)-oriented FePt/Ag composite films for perpendicular recording

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Acta Metallurgica Sinica(English Letters) 2009年第5期22卷 392-396页

作者： Wenfeng LIU Fang WANG xiaohong xu College of Materials Science and Engineering Taiyuan University of Science and Technology Taiyuan 030024 China School of Chemistry and Materials Science Shanxi Normal University Linfen 041004 China

FePt/Ag thin films were deposited by magnetron sputtering onto 7059 glass substrates, then were annealed at 550 ℃ for 30 min. Nanostructured FePt/Ag films were successfully obtained with the magnetic easy axis of L10 FePt perpendicular to the film plane. It was found that the development of （001） texture depended strongly on the thicknesses of FePt magnetic layer and Ag underlayer. The L10 ordered FePt（15 nm）/Ag（50 nm） with （001） orientation can be obtained. And the perpendicular coercivity of FePt（15 nm）/Ag（50 nm） film reached to 7.2× 10^5 A/m, whereas the longitudinal one was only 3.2×10^4 A/m. The non-magnetic Ag underlayer can not only induce （001） orientation and ordering of FePt grains, but also reduce the intergrain interactions.

关键词： FePt/Ag thin films (001) orientation FePt magnetic layer Agunderlayer Intergrain interaction

Magnetron sputtering deposition of [FePt/Ag]_n multilayers for perpendicular recording

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Rare Metals 2006年第1期25卷 47-50页

作者： WANG Fang xu xiaohong WU Haishun School of Chemistry and Materials Science Shanxi Normal University Linfen 041004 China

[FePt/Ag]n multilayers were deposited on glass substrates by RF magnetron sputtering and ex situ annealed at 550℃ for 30 min. The effects of inserted Ag layer thickness and the number of bilayer repetitions （n） on the structure and magnetic properties of the multilayers were investigated. It was found that the difference between in-plane and out-of-plane coercivities varied with an increase of inserted Ag layer thickness in the [FePt 2 nm/Ag x nm]10 multilayers. The ratio of out-of-plane coercivity to in-plane coercivity reached the maximum value with the Ag layer thickness of 5 nm, indicating that the Ag layer thickness plays an important role in obtaining perpendicular orientation. For the [FePt 2 nm/Ag 5 um]n multilayers, perpendicular orientation is also influenced by n. The maximum value of the ratio of out-of-plane coercivity to in-plane coercivity appeared when n was given as 8. It was found that the [FePt 2 nm/Ag 5 nm]8 had a high perpendicular coercivity of 520 kA/m and a low in-plane one of 88 kA/m, which shows a strong perpendicular anisotropy.

关键词： [FePt/Ag]n multilayer perpendicular orientation magnetron sputtering coercivity

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.

Robust nanoporous Cu/TiO_(2) ceramic filter membrane with promoted bactericidal function

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Science China(Technological Sciences) 2022年第11期65卷 2687-2694页

作者： ZHOU Li SHI ChunYing xu xiaohong JIA ChuanCheng Center of Single-Molecule Sciences Institute of Modern OpticsFrontiers Science Center for New Organic Matter Tianjin Key Laboratory of Micro-scale Optical Information Science and TechnologyCollege of Electronic Information and Optical EngineeringNankai UniversityTianjin300350.China School of Chemistry and Chemical Enginering Shandong UniversityJinan 250100China

Filter membrane technology has been extensively used for water ***,due to their high brittleness and biological fouling,filter membranes will gradually *** we develop a robust Cu/TiO_(2) ceramic filter membrane for water treatment,which has excellent inherent antibacterial activities both in the dark and under visible light *** nanobelt TiO_(2) can be sintered into a nanoporous membrane structure by overlapping and interweaving with each other,thereby achieving high flux simultaneously and solving the problem of high brittleness of inorganic ***,such one-dimensional TiO_(2) nanostructures can provide more deposition sites for Cu nanoparticles with inherent antibacterial activity in the *** realise the surface plasmon resonance-enhanced antibacterial activity under visible light,Cu/TiO_(2) heterostructures are used.

关键词： filter membrane one-dimensional TiO_(2) Cu/TiO_(2)heterostructure antibacterial activity

Policy and institutional reforms of China’s economic aid: motives and implications

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Economic and Political Studies 2020年第2期8卷 224-245页

作者： xiaohong xu Department of Diplomacy China Foreign Affairs UniversityBeijingChina

The People’s Republic of China(PRC)has been an aid donor for over six decades,offering multiple forms of development aid to other developing ***,China has been con-stantly readjusting its strategies of aid provision while introducing institutional reforms to improve the efficiency of aid as a form of economic *** significant policy and institutional changes has China conducted in its aid distribution?What are the key motivators that have propelled such reforms?And how do Western donors perceive the Chinese model of aid distribution?Using a two-level analytical framework,this article mainly explores the domestic and international factors driving the three rounds of Chinese aid *** article finds that while the transform-ation of China’s strategic priority enabled by leadership percep-tion change is the key domestic incentive for aid reforms,international variables contribute to such processes either directly by exerting pressure and conveying knowledge or indirectly by changing China’s global status and leadership perception.

关键词： China economic aid reforms motives

Corruption and economic growth:an absolute obstacle or some efficient grease?

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Economic and Political Studies 2016年第1期4卷 85-100页

作者： xiaohong xu Department of Diplomacy China Foreign Affairs UniversityBeijingChina

The relationship between bureaucratic corruption and economic growth has been a much debated topic in the studies of economics and political science in the past ***,no theoretical consensus has been reached in this *** to the divergence in theoretical perspectives,empirical evidence is mixed as *** a fundamental step to examine the correlation between corruption and economic growth,this review provides a systematic review of the existing theoretical and empirical research on corruption’s growth ***,the definition and statistical measurement of corruption is also *** review makes new contributions to the extant corruption literature since it not only incorporates the latest scholarship on the topic but highlights corruption’s differential growth effects in different organisational,institutional and geographical contexts.

关键词： Bureaucratic corruption economic growth empirical evidence review theoretical debate

Effect of Cu additive on the structure and magnetic properties of (CoPt)_(1-x)Cu_x films

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Rare Metals 2009年第1期28卷 14-18页

作者： HUANG Tingting WANG Fang GUO Juhong xu xiaohong School of Chemistry and Materials Science Shanxi Normal University Linfen 041004 China

CoPt thin films with various Cu contents varying from 0 vol.% to 21.5 vol.% were deposited on glass substrates by magnetron sputtering. The effects of Cu additive on the structural and magnetic properties and the ordering temperature of CoPt films were investigated in detail. The results show that the Cu in CoPt films plays an important role in promoting the ordering parameter S and reducing the ordering temperature of CoPt films. A nearly perfect （001） texture was obtained in a CoPt film doped with 15.3 vol.% Cu. Besides, the preferred orientation of the CoPt film can be changed by annealing temperature. The perpendicular growth of the CoPt film is favored at a high annealing temperature.

关键词： CoPt thin films Cu additive magnetron sputtering texture annealing temperature

Reversible control of magnetic and transport properties of NdNiO_(3-δ)epitaxial films

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Journal of Rare Earths 2021年第3期39卷 317-322,I0003页

作者： Huihui Ji Guowei Zhou Jun Zhang Xiaojiao Wang xiaohong xu Key Laboratory of Magnetic Molecules and Magnetic Information Materials Ministry of EducationSchool of Chemistry and Materials ScienceShanxi Normal UniversityLinfen 041004China Research Institute of Materials Science of Shanxi Normal University&Collaborative Innovation Center for Shanxi Advanced Permanent Magnetic Materials and Technology Linfen 041004China

Rare-earth nickelates possess intrinsic charge order,orbital order,and electron-lattice coupling,which make them very interesting for applications in oxide-based electronic *** this study,we grew NdNiO_(3-δ)(NNO) films with oxygen pressures changing from 27 to 10^(-5) *** decreasing oxygen pressure,the antiferromagnetic state of the NNO film becomes a ferromagnetic state,and the resistance increases *** to combined X-ray absorption spectro scopy and X-ray linear dichroism measurements,the ratio of Ni^(2+)-ions increases with decreasing oxygen-pressure,and the preferred orbital occupation changes from x^(2)-y^(2) to 3 z^(2)-r^(2).In addition,using the ionic-liquid gating method to control the migration of oxygen vacancies,both the magnetic properties and resistance of NNO films can be modulated *** oxygen vacancy induces a valence in the Ni ions and the orbital occupation changes,which alters the magnetic properties and the electronic transport in these NNO *** study describes a novel tunable method for electronic devices that use NdNiO_(3-δ) films,and opens new doors for future improvements and functionalities.

关键词： NdNiO3 films Oxygen vacancy Valence state Orbital occupation Ionic liquid gating Rare earths

Microstructure and magnetic properties of FePt/MgO multilayers deposited by RF magnetron sputtering

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Journal of University of Science and Technology Beijing 2008年第2期15卷 173-177页

作者： Xiaoli Li Fang Wang Fengxian Jiang xiaohong xu Haishun Wu School of Chemistry and Materials Science Shanxi Normal University Linfen 041004 China College of Chemistry and Chemical Engineering Taiyuan University of Technology Taiyuan 030024 China

FePt （50 nm） and [FePt（a nm）/MgO（b nm）5/glass （a=1, 2, 3; b=1, 2, 3） films were prepared by radio frequency （RF） magnetron sputtering technique, and then were annealed at 600℃ for 30 min. The effect of MgO layer thickness on the structures and magnetic properties of the FePt/MgO multilayers was investigated. The coercivities and inter-grain interactions of the FePt/MgO films were decreased, yet the degree of （001） texturing drastically increased with the increase in MgO layer thickness when the FePt layer thickness was fixed. Thus, the FePt/MgO films with appropriate coercivities, high perpendicular anisotropy, and weak intergrain interactions were obtained by controlling the MgO layer thickness. Overall, these results indicate that the FePt/MgO nanostructured films are promising candidates for future high-density perpendicular recording media.

关键词： FePt/MgO multilayer coercivity perpendicular anisotropy inter-grain interaction