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Anisotropic Magnetoresistance of Perovskite La_(2/3)Ca_(1/3)MnO_3/YBa_2Cu_4O_8/La_(2/3)Ca_(1/3)MnO_3 Trilayer Films

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Journal of Rare Earths 2005年第2期23卷 186-189页

作者：吴成张丽赵昆 Magnetoelectronics Laboratory School of Physics Science and Information Technology Liaocheng University Liaocheng 252059 China

The anisotropic magnetoresistance (MR) of La_(2/3)Ca_(1/3)MnO_3 (LCMO)/YBa_2Cu_4O_8 (YBCO) /LCMO sandwiches on (001) SrTiO_3 were investigated. Single layer LCMO and sandwiches show in-plane anisotropy of MR. MR strongly depends on the magnetic field direction. A nearly sinusoidal dependence on the angle between the applied magnetic field and the film plane or transport current was observed. A positive MR was present with lower fields applied not only out-of-plane but also in-plane.

关键词： magnetoresistance thin film magnetic anisotropy rare earths

Voltage control magnetism and ferromagnetic resonance in an Fe_(19)Ni_(81)/PMN-PT heterostructure by strain

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Chinese Physics B 2022年第7期31卷 544-548页

作者： Jun Ren Junming Li Sheng Zhang Jun Li Wenxia Su Dunhui Wang Qingqi Cao Youwei Du National Laboratory of Solid State Microstructures and Jiangsu Key Laboratory for Nano Technology Nanjing UniversityNanjing 210093China Hangzhou Dianzi University HangzhouZhejiang 310018China

Voltage control magnetism has been widely studied due to its potential applications in the next generation of information ***-PT,as a single crystal ferroelectric substrate,has been widely used in the study of voltage control magnetism because of its excellent piezoelectric ***,most of the research based on PMN-PT only studies the influence of a single tensile(or compressive)stress on the magnetic properties due to the asymmetry of *** this work,we show the effect of different strains on the magnetic anisotropy of an Fe_(19)Ni_(81)/(011)PMN-PT *** importantly,the(011)cut PMN-PT generates non-volatile strain,which provides an advantage when investigating the voltage manipulation of RF/microwave magnetic *** a result,a ferromagnetic resonance field tunability of 70 Oe is induced in our sample by the non-volatile *** results provide new possibilities for novel voltage adjustable RF/microwave magnetic devices and spintronic devices.

关键词： voltage control magnetism magnetoelectric coupling magnetic anisotropy ferromagnetic resonance

Large-scale area of magnetically anisotropic nanoparticle monolayer films deposited by MAPLE

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Journal of Materials Science & Technology 2022年第11期106卷 28-32页

作者： Lei Zhang Feng Xu Jian Zhang Baoru Bian Yong Hu Fei Xue Juan Du Key Laboratory of magnetic Materials and Devices Ningbo Institute of Material Technology&EngineeringChinese Academy of SciencesNingbo 315201China Institute of Materials School of Materials Science and EngineeringShanghai UniversityShanghai 200444China University of Chinese Academy of Sciences Beijing 100049China College of Sciences Northeastern UniversityShenyang 110819China Anhui Province Key Laboratory of Condensed Matter Physics at Extreme Conditions High Magnetic Field LaboratoryChinese Academy of SciencesHefei 230031China

magnetically anisotropic nanoparticle monolayer films are of great interest for the development of ap-plications such as high-density data storage,***,the formation of large-scale magnetically anisotropic monolayer film is a challenging ***,we provide a new way to fabricate large-scale area of Fe_(3)O_(4) nanoparticle monolayer films by vacuum deposition technique(matrix-assisted pulsed laser evaporation,MAPLE).During the deposition process,only interactions between nanoparticles influence nanoparticle self-assembly behaviors.A strong magnetic anisotropy,characterized by in-plane and out-of-plane coercivity and saturation field obtained by DCM(dynamic cantilever magnetometry),was obtained both in cubic and spherical Fe_(3)O_(4) nanoparticle monolayer *** inter-particle dipolar interaction but not crystal anisotropy is responsible for this effective magnetic anisotropy,which has been proved by Monte-Carlo simulations.

关键词： Nanoparticle monolayer film magnetic anisotropy MAPLE Dynamic cantilever magnetometry Monte-Carlo simulation Dipolar interaction

Effect of CoSi_2 buffer layer on structure and magnetic properties of Co films grown on Si(001) substrate

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Chinese Physics B 2015年第1期24卷 484-488页

作者：胡泊何为叶军汤进 Syed Sheraz Ahmad 张向群成昭华 State Key Laboratory of Magnetism and Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of Sciences Department of Physics Beihang University

Buffer layer provides an opportunity to enhance the quality of ultrathin magnetic films. In this paper, Co films with different thickness of Co Si2 buffer layers were grown on Si（001） substrates. In order to investigate morphology, structure,and magnetic properties of films, scanning tunneling microscope（STM）, low energy electron diffraction（LEED）, high resolution transmission electron microscopy（HRTEM）, and surface magneto-optical Kerr effect（SMOKE） were used. The results show that the crystal quality and magnetic anisotropies of the Co films are strongly affected by the thickness of Co Si2 buffer layers. Few Co Si2 monolayers can prevent the interdiffusion of Si substrate and Co film and enhance the Co film quality. Furthermore, the in-plane magnetic anisotropy of Co film with optimal buffer layer shows four-fold symmetry and exhibits the two-jumps of magnetization reversal process, which is the typical phenomenon in cubic（001） films.

关键词： magnetic anisotropy Co Si2 buffer layers four-fold symmetry

Synthesis,Structure and magnetic Behavior of a Novel Series of Trinuclear Windwheel Complexes

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Chinese Journal of Chemistry 2023年第24期41卷 3662-3668页

作者： Rong Luo Chen-Ze Xie Ming-Guang Chen Hai-Yan Shi Xiang-Jian Kong Yu-Hua Fan Feng Shao Key Laboratory of Marine Chemistry Theory and Technology Ministry of EducationCollege of Chemistry and Chemical EngineeringOcean University of ChinaQingdaoShandong266100 China Baotou Research Institute of Rare Earths BaotouInner Mongolia014040 China State Key Laboratory of Physical Chemistry of Solid Surfaces College of Chemistry and Chemical EngineeringXiamen UniversityXiamenFujian361005 China

A new family of trinuclear windwheel complexes with molecular formula [M^(II)_(3)(tpa)_(3)(μ-ttc)](ClO_(4))_(3)·n(sol) (ttc = 1,3,5-triazine-2,4,6-trithiol;tpa = tris(2-pyridylmethyl)amine;M = Mn,n = 2,sol = CH_(3)CN,1;M = Co,n = 1,sol = CH_(3)CN,2;M = Ni,n = 0,3) were synthesized and ***-crystal X-ray diffraction revealed that three metal centers in 1—3 are connected by ttc bridge,forming a regular triangular MII3 *** metal center is bonded by chelating S,N atoms from ttc and by N atoms from *** studies showed that 1—3 displayed antiferromagnetic behavior and further gave the easy-axis anisotropy (D = −0.77 cm^(−1) for 1 and −8.13 cm^(−1) for 2) and easy-plane anisotropy (D = 5.08 cm^(−1) for 3).Moreover,2 exhibited field-induced slow magnetic relaxation behavior and their effective energy barriers were roughly evaluated Ueff = 6.9 K.

关键词： Cluster compounds Crystal growth magnetic properties Slow magnetic relaxation magnetic anisotropy

Existence of long-range magnetic order in Heisenberg spin nanoribbons with edge modification

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Communications in Theoretical Physics 2024年第7期76卷 134-144页

作者： Da-cheng Ma Ling-yi Cui Chu-xiao Sun Xiao-dan Chi Zheng-Nan XianYu An Du College of Science Northeastern UniversityShenyang 110819China Department of Basic Science Dalian Naval AcademyDalian 116018China Department of Physics College of SciencesShenyang University of Chemical TechnologyShenyang 110142China National Frontiers Science Center for Industrial Intelligence and Systems Optimization Northeastern UniversityChina Key Laboratory of Data Analytics and Optimization for Smart Industry(Northeastern University) Ministry of EducationChina

Long-range magnetic order appears on a side decorated Heisenberg spin nanoribbon at nonzero temperature,although no spontaneous magnetization exists in a one-or two-dimensional isotropic Heisenberg model at any nonzero temperature according to the Mermin-Wagner *** use of the spin Green's function method,we calculated the magnetizations of Heisenberg nanoribbons decorated by side spins with single-ion anisotropy and found that the system exhibits a nonzero transition temperature,whether the decorated edge spins of the system link together or separate from each *** the width of the nanoribbon achieves infinite limit,the transition temperatures of the system tend to the same finite constant eventually whether one edge or both edges are decorated by side spins in the *** results reveal that the magnetism of a low-dimensional spin system is different from that of a threedimensional spin *** the single-ion anisotropy of edge spins in a Heisenberg spin nanoribbon can be modulated by an electric field experimentally,various useful long-range magnetic orders of the system can be *** work can provide a detailed theoretical basis for designing and fabricating next-generation low-dimensional magnetic random-access memory.

关键词： Nanoribbon magnetic anisotropy long-range magnetic order Heisenberg model transition temperature

Quantum Nucleation of Antiferromagnetic Bubbles with Tetragonal and Hexagonal Symmetries

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Communications in Theoretical Physics 2004年第2期41卷 311-320页

作者： PANHui ZHUJia-Lin LüRong DepartmentofPhysics TsinghuaUniversityBeijing100084China CenterforAdvancedStudy TsinghuaUniversityBeijing100084.China

We study the quantum nucleation in a nanometer-scale antiferromagnet placed in a magnetic field at an arbitrary angle. We consider the magnetocrystalline anisotropy with tetragonal symmetry and that with hexagonal symmetry, respectively. Different structures of the tunneling barriers can be generated by the magnitude and the orientation of the magnetic field. We use the instanton method in the spin-coherent-state path-integral representation to calculate the dependence of the rate of quantum nucleation and the crossover temperature on the orientation and strength of the field for bulk solids and two-dimensional films of antiferromagnets, respectively. We find that the rate of quantum nucleation and the crossover temperature from thermal-to-quantum transitions depend on the orientation and strength of the external magnetic field distinctly, which can be tested by use of existing experimental techniques.

关键词： macroscopic quantum phenomena tunneling magnetic anisotropy antiferromagnetics

Thickness-driven spin reorientation transition in ultrathin films

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Science China(Physics,Mechanics & Astronomy) 2013年第1期56卷 70-84页

作者： MIAO BingFeng MILLEV YonkoTimtchev SUN Liang YOU Biao ZHANG Wei DING HaiFeng National Laboratory of Solid State Microstructures and Department of Physics Nanjing University American Physical Society 1 Research RoadRidgeNew YorkUSA

We review recent studies by different experimental means of ultrathin films,exhibiting thickness-driven spin reorientation transitions(SRTs).The stage is set by determining,via phenomenological thermodynamic description,of the relevant phase diagrams for the possible types of SRT with and without applied magnetic *** representation may be chosen such that best use is made of the linear character(under thickness variation) of the system's path in anisotropy *** latter involves higher-order bulk and surface anisotropies in a substantial *** examine sensitive experimental techniques for the detection and quantification of SRTs,such as hysteresis measurements with magneto-optical Kerr effect(MOKE),micromagnetic studies utilizing scanning electron microscopy with polarization analysis(SEMPA),photoemission electron microscopy(PEEM) and spin-polarized low-energy electron microscopy(SPLEEM) as well as ac magnetic susceptibility measurements via *** issues are conclusively discussed including the identification of reliable experimental fingerprints about whether a given SRT proceeds via a phase of coexistence or via a cone(canted) *** demonstrate how the application of the general theoretical ideas to carefully designed measurements leads to the determination of the most important material parameters in any ultrathin-film SRT,namely,the surface(interface) magnetic anisotropy *** review concludes by our personal outline for future promising work on SRTs.

关键词： ultrathin magnetic films spin reorientation transitions magnetic anisotropy

Structural and magnetic Properties of Electrodeposited Ni_(70)Fe_(30) Nanowire Array

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Journal of Wuhan University of Technology(Materials Science) 2008年第4期23卷 472-474页

作者： XU Jinxia WANG Keyu Department of Materials Science and Engineering Hohai university Nanjing 210098 China Analysis ＆ Test Center Nanjing Normal University Nanjing 210097 China

Ordered Ni70Fe30 nanowire array was fabricated in a porous alumina template by alternating current electrodeposition. The structural and magnetic properties of the as-obtained nanowire array were investigated by SEM, TEM, XRD, EDS and VSM. The results indicate that the as-obtained Ni70Fe30 nanowires exhibit a diameter of about 69.9 nm and aspect ratio of more than 60. Meanwhile, a preferred orientation [110] of bcc lattice was observed. The as-obtained nanowire array has an obvious magnetic anisotropy, of which the easy direction is perpendicular to the surface of the array. Moreover, after annealed, the Ni70Fe30 nanowire array exhibits an enhanced magnetic anisotropy.

关键词： Ni70Fe30 nanowire array preferential orientation magnetic anisotropy