The origin of large perpendicular magnetic anisotropy observed in Co/sub 3/Pt alloy thin films

摘要

The relation between the perpendicular magnetic anisotropy constant K/sub u/ and the order parameter S of the Co/sub 3/Pt ordered phase is examined. The ordering process is suggested to be governed by a surface diffusion based on the activation energy obtained and annealing experiments. Lowering the deposition rate shows significant improvement in both K/sub s/ and S at substrate deposition temperature T/sub s/=330/spl deg/C. The utilization of a Ru buffer layer does not contribute to obtain higher K/sub u/ and S. This may be due to the rougher surface of Ru buffer layer than Al/sub 2/O/sub 3/(00/spl middot/1) substrate.