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Low temperature deposited L10 FePt–C (001) films with high coercivity and small grain size

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6 Author(s)
Chen, J.S. ; Data Storage Institute, DSI Building, 5 Engineering Drive 1, Singapore 117608, Singapore and Department of Materials Science and Engineering, National University of Singapore, Singapore 117576, Singapore ; Lim, B.C. ; Hu, J.F. ; Liu, B.
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FePt–C films with high coercivity, (001) texture, and small grain size were deposited on MgO/CrRu/glass substrate by cosputtering FePt and carbon at 350 °C. The out-of-plane coercivity measured at room temperature increased from 9.6 to 15.1 kOe when C concentrations increased from 0% to 15%. Further increasing the C contents to 20% and 25% caused the decrease of coercivity to 13.6 and 11.8 kOe, respectively. With C doping, a two-layer structure of FePt–C films was formed and fcc-phase FePt particles were found. By optimizing the sputtering process, FePt–C (001) film with coercivity higher than 14.4 kOe and columnar FePt grains of 7.5 nm in diameter was obtained, which are suitable for ultrahigh density perpendicular recording.

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Applied Physics Letters  (Volume:91 ,  Issue: 13 )