SPT垂直ライトヘッドにおける反強磁性結合多層膜の膜構成最適化検討(磁気記録)

概要

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Perpendicular magnetic recording using a single-pole-type (SPT) writer head and a double-layer perpendicular medium with a soft underlayer (SUL) has several advantages for high-density magnetic recording. It is therefore a promising candidate for a next-generation magnetic recording system. However, the pole-erase phenomenon, which is a signal reduction caused by a remanent head field from the main pole, prevents high-density recording. We investigated an SPT writer head with antiferromagnetic- (AFM-) coupled main pole to avoid the pole-erase phenomenon by using recently developed combined micromagnetics and finite-element method simulations. We demonstrated that the recording head field decreases monotonically with increasing number of AFM-coupled layers. On the other hand, residual field (pole-erase field) strength dramatically decreases to around half while applying an AFM-coupled bi-layer for the main pole. The pole-erase field is almost constant in the case of two or more layers. The optimum layer number of an AFM-coupled multilayer for the main pole is from two to four layers from the recording and pole-erase field point of view. We confirmed the same tendency by experimental observation of the pole-erase.
社団法人日本磁気学会の論文
2005-04-01