シミュレーションによるキーパー媒体・薄膜ヘッド系の記録再生特性

概要

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Two-dimensional read/write simulation based on the Maxwell equations was performed by a finite element method on a system consisting of a keepered medium (KM) with a thin soft magnetic layer (keeper layer) over a recording layer and a thin-film head.In the write process, the KM is given a weaker head field than the UKM.But the KM's magnetization is larger than that of the UKM because of an image effect in the write and after-write processes.In the read process, the keeper layer reduces the practical spacing by means of the image effect, and improves the read resolution by introducing a virtual gap (VG).Then, the keeper layer with the optimum parameters (e.g. μ=100, t=15nm, Bs=1.5T)decreases the demagnetizing field in the recording layer (e.g.Mr=560kA/m, t=36nm, Hc=167kA/m)by 1/2, and increases the recorded magnetization by 1/4.As a result, the thermal stability of the recording magnetization can be doubled.Therefore, the KM will be an attractive medium with better thermal stability if the optimum parameters are chosen.
社団法人日本磁気学会の論文
2000-04-15