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Comparison between Top and Bottom NiO-pinning Spin Valves: Effect of interfacial roughness on Specular Reflection

Journal of Materials Science & Technology 2006年第3期22卷 397-400页

作者： Liang SUN Jun DU Xiaoshan WU Shiming ZHOU Xixiang ZHANG An HU National Laboratory of Solid State Microstructures Department of Physics Nanjing University Nanjing 210093 China State Key Laboratory for Surface Physics Fudan University Shanghai 200433 China Department of Physics Hong Kong University of Science ＆ Technology Kowloon Hong Kong China

Top and bottom NiO-pinning spin valves of Si/Ta/NiO/Co/Cu/Co/Ta and Si/Ta/Co/Cu/Co/NiO/Ta were prepared by magnetron sputtering, and X-ray diffraction and giant magnetoresistance （GMR） ratio were measured in the temperature range from 5 to 300 K. For the bottom spin valve, the interracial roughness at NiO/Co is much smaller than that of Co/NiO in the top one. The Co/Cu and Cu/Co interfaces have the same roughness in the bottom and the top spin valves. NiO, Co, and Cu layers have （111） preferred orientations in the top one and random orientations in the bottom one. The GMR ratio of the bottom spin valve is larger than that of the top one at all temperatures and their difference increases with decreasing temperature.

关键词： Spin valve Specular reflection interfacial roughness

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Quantum Theory for interfacial roughness and Angle Dependence of Giant Magnetoresistance in Magnetic Multilayers

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Communications in Theoretical Physics 2001年第3期35卷 355-359页

作者： TAOYong－Chun DONGZheng－Chan NationalLaboratoryofSolidStateMicrostructuresandDepartmentofPhysics NanjingUniversityNanjing210093China NationalLaboratoryofSolidStateMicrostructuresandDepartmentofPhysics Nanji

The giant magnetoresistance (GMR) in magnetic multilayers with current in the plane of the layers is studied by using the quantum-statistical Green's function approach, in which the effects of the interfacial roughness and magnetization configuration on the GMR are included. It is shown that the maximal GMR first increases and then decreases with increasing interfacial roughness, exhibiting a peak at an optimum value of interfacial roughness. An approximately linear dependence of GMR on is obtained, where is the angle between magnetizations of the two successive ferromagnetic layers. Furthermore, the maximal GMR is found to increase with increasing the number of bilayers.

关键词： giant magnetoresistance interfacial roughness angle dependence Green's function magnetic multilayers

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