Fine control of L1[sub 0] ordering and grain growth kinetics by C doping in FePt films

Ko, Hyun Seok; Perumal, A.; Shin, Sung-Chul
April 2003
Applied Physics Letters;4/7/2003, Vol. 82 Issue 14, p2311
Academic Journal
We present the results on highly anisotropic oriented face-centered-tetragonal ordered equiatomic FePt thin films embedded in a C matrix prepared by cosputtering technique on MgO (100) substrates at 400 °C. We have found that doping of C in FePt alloy films is an effective and appropriate way to control the L 1[sub 0] ordering and growth of grain size down to 4 nm. Room-temperature magnetic measurements reveal that perpendicular magnetic anisotropy exists for these films with C concentration up to 25 vol %. These films are very promising and the results are of relevance for ultrahigh-density magnetic recording media.


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