高周波対応MoNiFeめっき膜の検討  [in Japanese] Electroplated MoNiFe Films for High Frequency  [in Japanese]

To realize higher-frequency recording, a material with a resistivity (ρ) higher than Ni_<80>Fe_<20> is needed. We thoroughly inrestigated electroplated Ni_<80>Fe_<20> 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 Ni_<80>Fe_<20> head. As a result, we confirmed that MoNiFe films were practical high-ρ pole materials for high-frequency recording.