Solution Conditions for CoNi Ferrite Perpendicular Magnetic Recording Thin Films.

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  • Zhang Fuchun
    Department of Physical Electronics, Tokyo Institute of Technology
  • Kitamoto Yoshitaka
    Department of Physical Electronics, Tokyo Institute of Technology
  • Abe Masanori
    Department of Physical Electronics, Tokyo Institute of Technology

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Other Title
  • 磁性材料　　ＣｏＮｉフェライト垂直磁気薄膜の作製におけるめっき溶液条件の最適化
  • CoNi フェライト スイチョク ジキ ハクマク ノ サクセイ ニ オケル メッキ ヨウエキ ジョウケン ノ サイテキカ

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Abstract

CoNi ferrite thin films were prepared for perpendicular magnetic recording media by spin-spray ferrite-plating method. In this paper, solution conditions for CoNi ferrite plating were optimized to increase coercivity Hc⊥ and remanence ratio (Mr/Ms)⊥ in perpendicular direction to the film plane. By adjusting the deposition rate, the concentration of NaNO2 to optimize the ratio of Fe2+ to Fe3+ in the films and the concentration of CH3COONH4 to optimize pH in oxidizing solution, CoNi ferrite films with Hc⊥ of 3200 Oe and (Mr/Ms)⊥ of 0.6 were obtained without any heattreatment. Disk media prepared under the optimized solution conditions exhibited reproduced waveforms of dipluse shape and better frequency responses than that with lower Hc⊥ and (Mr/Ms)⊥.

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