Effect of Cross-Track-Direction Grooves of a SUL on Magnetization Transitions

DOI Web Site 10 References
  • FUDANO Kinya
    NEC Software Tohoku, Ltd.:Research Institute of Electrical Communication, Tohoku Univ.
  • NAKAMURA Yoshihisa
    Iwate Prefectural Univ.:Research Institute of Electrical Communication, Tohoku Univ.
  • Yamakawa Kiyoshi
    AIT, Akita R & D Center:Research Institute of Electrical Communication, Tohoku Univ.
  • Muraoka Hiroaki
    Research Institute of Electrical Communication, Tohoku Univ.

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Other Title
  • 磁化転移に与えるクロストラック方向溝付きSULの効果(信号処理および一般)
  • 磁化転移に与えるクロストラック方向溝付きSULの効果
  • ジカ テンイ ニ アタエル クロストラック ホウコウ ミゾツキ SUL ノ コウカ

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Abstract

A high head field gradient is the most crucial criterion for a write head. A new approach with a grooved soft magnetic underlayer (SUL) structure was investigated for use with a single-pole planar writer. Cross-track grooves on the SUL surface improved the writing field gradient without degrading the field strength. In this study, a detailed analysis of the head field distributions and writing process with the heads and medium were performed using a finite-element method (FEM) computer simulation. The simulator was combined with a Stoner-Wohlfarth magnetization reversal model, in which head-medium magnetic interactions were incorporated by calculating the head and medium magnetization together as a 'self-consistent' system, designated as "SMART". A maximum gradient greater than 1000 Oe/nm was confirmed with the grooved SUL structure and the recorded magnetization distribution for the high gradient writing head field was calculated.

Journal

  • ITE Technical Report

    ITE Technical Report 33.57 (0), 67-72, 2009

    The Institute of Image Information and Television Engineers

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