High coercive L10 FePt-C (001) nanocomopsite films with small grain size for perpendicular recording media

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作者：
Chen, J.S. [1 ,2 ]
Hu, J.F. [2 ]
Lim, B.C. [1 ,2 ]
Lim, Y.K. [2 ]
Liu, B. [2 ]
Chow, G.M. [1 ]
Ju, G. [3 ]
机构：
[1] Department of Materials Science and Engineering, National University of Singapore, Singapore 117576, Singapore
[2] Data Storage Institute, DSI Building, 5 Engineering Drive 1, Singapore 117608, Singapore
[3] Seagate Technology, Pittsburgh, PA 15222-4215, United States
来源：
Journal of Applied Physics | 2008年 / 103卷 / 07期
关键词：
FePt-C films with various C concentrations were deposited on MgOCrRu /glass substrate by cosputtering FePt and C at 350 °C. The evolution of magnetic properties and microstructure of FePt-C films with the C concentration were investigated. All FePt films showed (001) preferred orientation regardless of C concentrations. With C doping; a two-layer structure of FePt-C films was formed. The FePt-C underlying layer epitaxially grown on MgO intermediate layer were L 10 FePt grains; while the FePt overlayer consisted of fcc FePt phase and L 10 FePt phase. The out-of-plane coercivity measured at room temperature increased from 10.2 to 19 kOe when C concentrations increased from 0% to 15%. Further increasing the C contents to 20% and 25% caused the decrease of coercivity to 17.2 and 14.8 kOe; respectively. © 2008 American Institute of Physics;
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