磁気的層間結合を利用した高浮遊磁界耐性化裏打ち膜の材料課題(磁気記録媒体)

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To reduce the spike noise caused by stray magnetic fields, we investigated layered stacking soft-magnetic underlayers (SULs) with interlayer magnetic coupling. To reduce SUL noise as well, nanocrystalline or amorphous materials are used in the large part of the soft-magnetic layer. Through investigation of material problems in ferromagnetic (FM)/nonmagnetic (NM) stacked SULs and antiferromagnetic (AFM)/ferromagnetic (FM) stacked SULs, the following points were clarified : (1) In the case of FM/NM stacked layers using Ru as the NM layer and CoZrNb as the FM layer, when the layer structure of CoZrNb (150 nm)/Ru (0.6 nm)/CoZrNb (150 nm) was adopted, the M-H loop was shifted due to RKKY interlayer exchange coupling. The value of the interlayer exchange coupling constant J was derived at a small value of 0.015 erg/cm^2. (2) In the above layer structure, by sputtering the Ru layer under Ar + O_2 atmosphere, or by introducing a Co_<70>Fe_<30> layer which has high saturation magnetization M_s, between the Ru layer and CoZrNb layer, the value of H_<ex> and J were enhanced. The J value shows prospects of enhancement over one digit if appropriate materials and process are introduced. (3) In AFM/FM stacked SULs, the unidirectional anisotropy constant J_k between the AFM and FM layers was reduced by increasing the thickness of the FM layer. The principal problem is how to suppress the reduction of J_k by controlling the soft magnetic properties of the FM layer.
社団法人日本磁気学会の論文
2003-04-01

磁気的層間結合を利用した高浮遊磁界耐性化裏打ち膜の材料課題(磁気記録媒体)

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