Simulations of magnetic recording in coupled granular/continuous perpendicular media with random pinning sites

Andy M. Goodman*, Simon J. Greaves, Y. Sonobe, H. Muraoka, Y. Nakamura

*この研究の対応する著者

研究成果: Conference article査読

11 被引用数 (Scopus)

抄録

Magnetic recording in coupled granular/continuous (CGC) media with random pinning sites is simulated using a three-dimensional (3-D) micromagnetic model. Pinning sites are introduced via a random anisotropy constant Ku, which follows a log-normal distribution with a mean value 〈Ku〉 of 1 × 106 (ergs/cc) and a standard deviation σKu (ergs/cc). For a range σKu, we vary the thickness of the continuous layer c and the thickness of the granular layer g, while maintaining a constant media thickness. We analyze simulated tracks to produce SNR data for a range of c anal σKu. We find that increasing σKu reduces signal and increases bit transition irregularity and noise, which is then reduced via a mechanism driven by domain wall (DW) energy minimization by increasing c. Thus, we find that previous results hold in a more realistic CGC media model that contains random irregularity. In order to explain the observed effects, we identify three regimes of behavior that depend on the energy of domain wall relative to the pinning energy barriers provided by the granular layer.

本文言語English
ページ(範囲)2051-2053
ページ数3
ジャーナルIEEE Transactions on Magnetics
38
5 I
DOI
出版ステータスPublished - 2002 9月
外部発表はい
イベント2002 International Magnetics Conference (Intermag 2002) - Amsterdam, Netherlands
継続期間: 2002 4月 282002 5月 2

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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