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

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• 作者：Xiaoli Li ; Fang Wang ; Fengxian Jiang ; Xiaohong Xu ; Haishun Wu
• 关键词：FePt/MgO multilayer ; coercivity ; perpendicular anisotropy ; inter-grain interaction
• 刊名：Journal of University of Science and Technology Beijing, Mineral, Metallurgy, Material
• 出版年：2008
• 出版时间：April 2008
• 年：2008
• 卷：15
• 期：2
• 页码：173-177
• 全文大小：674 K

文摘

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°C 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.