Co_<60>Cr_<40>/極薄C中間層を用いたCoCrPtB垂直磁気記録媒体の磁気特性と微細構造 : 垂直磁気記録媒体

概要

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The perpendicular magnetic properties and structures of CoCrPtB/Ti, CoCrPtB/Co_<60>Cr_<40>/Ti, and CoCrPtB/Co_<60>Cr_<40> /C/Ti perpendicular media were investigated. By examining the growth forms of a Co_<60>Cr_<40> intermediate layer and a magnetic layer, as well as the effects of inserting a very thin C layer, the following points were clarified: (1) in the case of a Co_<60>Cr_<40> intermediate layer fabricated without a C layer, hcp phase with a high concentration of Cr is formed at T_<sub.> ≤ 250℃, and both σ phase and hcp phase with low Cr concentrations are formed at T_<sub.> ≤ 300℃; (2) in the case of a Co_<60>Cr_<40> intermediate layer fabricated on a very thin C layer, hcp phase with high concentration of Cr is formed only at TT_<sub.> ≤ 150℃. At TT_<sub.> ≤ 200℃, only the initial nucleation growth of hcp phase with low Cr concentration is formed, which inhibits the formation of σ phase; (3) in the case of a CoCrPtB/Co_<60>Cr_<40>/C/Ti medium, nanocrystalline grains are formed in the initial growth region. In the upper region, c-plane-oriented grains of hcp phase with Cr segregated structure grow in a columnar shape. As a result, the grains of the magnetic layer grow epitaxially on the intermediate layer and the perpendicular magnetic properties are improved remarkably.
社団法人日本磁気学会の論文
2002-04-01