PdPtMn反強磁性材料を用いたスピンバルブ (<特集>多層膜・人工格子・グラニューラー)

概要

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Antiferromagnetic film has been used as a pinning layer for a spin-valve head. For practical applications, however, a less corrosive antiferromagnetic layer than those currently available is required. We succeeded in obtaining a new PdPtMn antiferromagnetic layer with high corrosion resistance, which gave a high H_<ua> to a coupled Ni-Fe film when annealed of a temperature lower than 230℃. We fabricated spin-valve films using this Pd_<31>Pt_<17>Mn_<52> material, and obtained an MR ratio of 7.2% by annealing at 230℃, although the H_c of the pinned Ni-Fe layer became larger than that when an Fe-Mn antiferromagnetic material was used. The new material is suitable for use as the pinning layer of a spin-valve film. However, further research is needed to decrease the H_c.
社団法人日本磁気学会の論文
1997-04-15