反強磁性結合を用いた積層バイアスCPP-GMRヘッド(磁気記録)

概要

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We investigated enhanced in-stack longitudinal biasing, which was newly designed to strengthen longitudinal biasing by investing the antiferromagnetic exchange coupling, H^<int, LBL> in a spacer between a free and a ferromagnetic layer of the in-stack biasing layers. Micromagnetic simulation showed that H^<int,LBL> diminishes hysteresis and improves the linearity of a transfer curve through cooperation with a magnetostatic coupling effect at the sensor edges. We found that CPP-GMR sensors with various H^<int, LBL> values and magnetostatic coupling effects were formed by adjusting the thickness of the spacer and the ferromagnetic layer. Transfer curve measurements for fabricated head devices using such CPP-GMR sensors revealed that H^<int, LBL> played an importance role in diminishing hysteresis in transfer curves, and that higher output was obtained at moderate H^<int, LBL> values. Consequently, the enhanced in-stack longitudinal biasing was demonstrated to have both higher stability and higher output.
社団法人日本磁気学会の論文
2007-03-01