GMRヘッド再生シールドの突発的透磁率変化 : 磁気ヘッド

概要

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The magnetostatic interaction between the GMR elements and the shields of shielded GMR heads was investigated by micromagnetic modeling of the GMR elements and the shields. The magnetization patterns in the shields were determined in order to minimize the total energy of the shields. The biasing field of the GMR element was defined by the sum of the permanent magnet field and its images in the shields. It was confirmed that the magnetization curves of shields with permanent magnets show hysteric behavior, and double- or single-flux closure appeared in the domain structure. The transition from double-flux closures to a single-flux closure causes sudden permeability change in the shields. A permeability change will produce changes in the imaging field of the permanent magnets in the shields. As a result, a Barkhausen jump corresponding to a permeability change appears in the easy-axis transfer curves (i.e., the GMR response vs. the easy-axis field).
社団法人日本磁気学会の論文
2002-04-01