Abstract
To realize higher-frequency recording, a material with a resistivity (ρ) higher than Ni80Fe20 is needed. We thoroughly investigated electroplated Ni80Fe20 films with added Mo to obtain a high-ρ material. We found that MoNiFe films consisting of Mo : 2-3 at%, Ni : 79-80 at%, and Fe : 17-19 at% had good soft magnetic characteristics, high ρ (> 40 μΩcm), and high corrosion resistance. We fabricated a merged-type MR head, using MoNiFe for the upper pole of the write head, and observed the magnetization response at 50 MHz with SKEM. The head showed good magnetization response, which meant that if head higher write efficiency than a Ni80Fe20 head. As a result, we confirmed that MoNiFe films were practical high-ρ pole materials for high-frequency recording.
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