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

Xiaoli Li1,2), Fang Wang1), Fengxian Jiang1,2), Xiaohong Xu1), and Haishun Wu1) 1) School of Chemistry and Materials Science, Shanxi Normal University, Linfen 041004, China 2) College of Chemistry and Chemical Engineering, Taiyuan University of Technology, Taiyuan 030024, China

摘 要：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 in-ter-grain interactions were obtained by controlling the MgO layer thickness. Overall, these results indicate that the FePt/MgO nanos-tructured films are promising candidates for future high-density perpendicular recording media.

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