Ｃｏ６０Ｃｒ４０／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

概要

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The perpendicular magnetic properties and structures of CoCrPtB/Ti, CoCrPtB/Co60Cr40/Ti, and CoCrPtB/Co60Cr40/C/Ti perpendicular media were investigated. By examining the growth forms of a Co60Cr40 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 Co60Cr40 intermediate layer fabricated without a C layer, hcp phase with a high concentration of Cr is formed at Tsub.≤ 250°C, and both σ phase and hcp phase with low Cr concentrations are formed at Tsub.≥ 300°C; (2) in the case of a Co60Cr40 intermediate layer fabricated on a very thin C layer, hcp phase with high concentration of Cr is formed only at Tsub.≤ 150°C. At Tsub.≥ 200°C, 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/Co60Cr40/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.
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