Co_3Pt合金薄膜における垂直磁気異方性の起源

概要

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The origin of a anisotropy of the order of 10^7 erg/cm^3 observed in Co_3Pt alloy thin films deposited onto Al_2O_3(00・1) substrates is investigated. The magnetic anisotropy constant K_u increases with the substrate deposition temperature T_s, which exhibits a maximum at T_s≈400℃. The Co_3Pt ordered phase is found to exist in these films. The order parameter S estimated by X-ray diffraction reaches a maximum at T_s≈400℃. The behaviors of K_u and S with respect to T_s are similar when T_s is greater than about 380℃ The samples show a larger K_u with higher S. Howeber, K_u still remains 10^7 erg/cm^3 at S=0. Both K_u and S can be enhanced by reducing the deposition rate at T_s≈330℃. On the basis of these experimental results, a model is proposed to account for the dependence of K_u on S. In this model, the observed K_u is assumed to include two components of the disordered and ordered phases. The contributions of the disordered and ordered phases to the total magnetic anisotropy can be reasonably well quantified on the basis of the model.
社団法人日本磁気学会の論文
1999-07-01