Interdiffusion in Ni 80 Fe 20 /Mo magnetic multilayers prepared by magnetron sputtering
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Interdiffusion in Ni80 Fe20yMo magnetic multilayers prepared by magnetron sputtering X. Y. Zhang Institute of Physics, Chinese Academy of Sciences, Beijing 100080, and College of Materials Science and Engineering, Yanshan University, Qinhuangdao 066000, People’s Republic of China
Y. F. Xu Institute of Physics, Chinese Academy of Sciences, Beijing 100080, People’s Republic of China
M. L. Yan State Key Laboratory of Magnetism, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, People’s Republic of China
L. M. Chao, M. Zhang, and J. H. Zhao Institute of Physics, Chinese Academy of Sciences, Beijing 100080, People’s Republic of China
W. Y. Lai State Key Laboratory of Magnetism, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, People’s Republic of China
W. K. Wang Institute of Physics, Chinese Academy of Sciences, Beijing 100080, and College of Materials Science and Engineering, Yanshan University, Qinhuangdao 066000, People’s Republic of China (Received 29 December 1997; accepted 24 July 1998)
The interdiffusion in Ni80 Fe20yMo magnetic multilayers with a repeat length of 3.4 nm has been investigated using x-ray diffraction (XRD) technology. The multilayers have been fabricated by using a magnetron sputtering system. The decay with annealing time in the intensity of the first-order x-ray satellite peak arising from the composition modulation was used to determine the effective interdiffusion coefficient Dl . As the annealing temperature is below 483 K, the interdiffusion is found to be relatively slow (Dl , 8.88 3 10225 m2ys). This result suggests that the Ni80 Fe20yMo multilayers have a strong resistance to the atomic interdiffusion between sublayers. The diffusivities over the temperature range 343–683 K have an Arrhenius-type temperature dependence with a pre-exponential factor D0 s4.02 6 1.21d 3 10222 m2ys and an activation enthalpy of about 0.26 6 0.08 eV. The much lower activation enthalpy is attributed to the coherence strains existing in the multilayers.
I. INTRODUCTION
Since giant magnetoresistance (GMR) effect and antiferromagnetic (AFM) interlayer exchange coupling were found in FeyCr magnetic multilayers,1,2 much effort has been devoted to searching for various magnetic/nonmagnetic metal multilayered systems that show AFM coupling and/or GMR effect. The primary cause for driving the considerable attention in the GMR and AFM effect is due to their new and interesting physical phenomena and potential utility as the sensor element in a magnetoresistive read head for information storage systems. As a result, many magnetic multilayers have been found to be the same class of materials as FeyCr multilayers. Examples include FeyCu, CoyCu, FeyMo, and CoyPt, etc.3 – 6 Recently, the multilayers containing magnetically soft Ni81 Fe19 layers have attracted more interest for technological interest in order to prepare the multilayers with a large resistance change at a lower field in the 984
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