Effect of intergranular exchange coupling on transition irregularity in coupled granular/continuous perpendicular media

A. M. Goodman*, H. Muraoka, S. J. Greaves, K. Miura, Y. Sonobe, Y. Nakamura

*この研究の対応する著者

研究成果: Article査読

9 被引用数 (Scopus)

抄録

Recent simulations of coupled granular/continuous (CGC) perpendicular media are reviewed, and mechanisms previously shown to reduce bit transition irregularity are clarified using three-dimensional micromagnetic model that includes a simple representation of grain shape irregularity. Increasing intergranular exchange coupling is found to resolve magnetic clusters at the bit transition into smaller switching units. This is shown to reduce the amplitude and cross-track correlation length of the transition irregularity. The signal-to-noise ratio (SNR) of high-density granular media and CGC media is optimized with respect to intergranular exchange coupling. Depending on the media parameters used, the recording properties of granular and CGC media are found to differ, with CGC providing greater SNR. Preliminary experimental data are presented and found to support the results obtained from simulations.

本文言語English
ページ(範囲)685-690
ページ数6
ジャーナルIEEE Transactions on Magnetics
39
2 I
DOI
出版ステータスPublished - 2003 3月
外部発表はい

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 電子工学および電気工学

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