CoCr基垂直薄膜媒体の回転ヒステリシス損失消失磁界の膜厚依存性 : 垂直磁気記録媒体

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The thickness dependence of a magnetic field from which the rotational hysteresis loss has vanished was experimentally investigated for CoCrPtB perpendicular recording media. It was clarified that (1) in Co_<72>Cr_<16>Pt_8B_4 media with film thickness d_<mag.> under 200 nm and Co_<64>Cr_<64>Pt_8B_4 media with d_<mag.> under 100 nm, a homogeneous structure was realized, except for the existence of an initial growth region with a thickness of about 2 nm; (2) for both media, the perpendicular rotational hysteresis loss W_r, the maximum field of W_r, H_p, and the field where W_r = 0, H_<Wr=0>, increase with increasing d_<mag.> (3) for both media, H_<Wr=0> increases with increasing d_<mag.> and saturates at a field of about magnetic aniaotropy field H^<grain>_k ; and (4) for a medium with a thin magnetic film, at an applied field H_<Wr=0> < H < H^<grain>_k in a direction parallel to the film plane, a multi-domain state is realized, even though no hysteresis loss has been observed in torque measurement at this field. The last of these findings is considered to be due to the existence of thermal agitation between the multi-domains.
社団法人日本磁気学会の論文
2002-04-01