電気めっき法による高飽和磁束密度ソフト材料の開発とMRヘッドコアへの応用

概要

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Magnetic recording densities are increasing rapidly as a result of the development of new media, heads, and related technologies, and have now reached 3 to 4 Gb/in^2. New materials for MR write head cores instead of plated 82-permalloy, are strongly needed in order to realize higher densities, as well as GMR sensor materials. In this review, we present and review CoNiFe materials that we developed by means of an electroplating method. This ternary alloy was firstly developed in the 1950s, but we recently newly-developed it as a soft material with high B_s(saturation magnetic flux density). One of the optimum points Co_<65>Ni_<12>Fe_<23>(at%)with B_s=2.1 T, λ_s=2×10^<-6>, and H_c=1.7 Oe. This material shows the thermal stability up to 270℃ and almost the same corrosion resistance as the plated 82-permalloy. The results of using the material for commercial production of developed MR head are briefly reviewed. In addition, soft magnetic materials with high ρ(resistivity), by an electroplating method, are also reported.
社団法人日本磁気学会の論文
1998-08-01