NiO/CoO, FeMn, およびNiMn反強磁性材料を用いたスピンバルブヘッドのピン層磁化安定性

概要

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An abnormal reproduced waveform was observed in spin-valve(SV)heads. We show that this abnormal waveform was caused by instability of the pinned-layer magnetization even below the blocking temperature(T_b). In SV heads with an NiO/CoO-bilayer (NiO/CoO-SV heads), the pinned-layer magnetization is easily aligned to the track width direction and becomes unstable even at room temperature. FeMn-SV heads showed a relatively stable waveform, in contrast to NiO/CoO-SV heads. However, below a temperature of 100℃, the pinned-later magnetization reverses and is pinnde easily to the direction of the applied current field. On the other hand, the pinned-layer magnetization in NiMn-SV heads is highly stable, mainly because of the high T_b.
1998-04-15