Influence of Temperature and Magnetic Field on Recorded Magnetization Structure of Perpendicular Recording Media

  • Yasui Y.
    Faculty of Science and Engineering, Chuo University
  • Shimomai K.
    Faculty of Science and Engineering, Chuo University
  • Futamoto M.
    Faculty of Science and Engineering, Chuo University

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Other Title
  • 垂直磁気記録媒体の記録磁化状態に及ぼす温度および外部磁界の影響
  • スイチョク ジキ キロク バイタイ ノ キロク ジカ ジョウタイ ニ オヨボス オンド オヨビ ガイブ ジカイ ノ エイキョウ

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Abstract

The effect of elevated temperature and magnetic field on recorded magnetization structure of a perpendicular magnetic recording HDD medium has been studied by in-situ magnetic force microscopy (MFM). The recorded bit shape started to change in the track and the cross-track directions when heated at 200°C. When a magnetic field was applied at elevated temperatures, variation of recorded magnetization was enhanced compared with the case with only heating. A quantitative analysis of magnetization structure variation under an influence of heat and magnetic field is carried out by taking the difference of MFM images observed for a same area under different environmental conditions.

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