Effect of continuous layer in CGC perpendicular recording media

Y. Sonobe, K. K. Tham*, T. Umezawa, C. Takasu, J. A. Dumaya, P. Y. Leo

*この研究の対応する著者

研究成果: Article査読

14 被引用数 (Scopus)

抄録

The effect of continuous layer on CoCrPt-SiO2 granular layer is studied in coupled granular continuous (CGC) perpendicular recording media. In the cross-section transmission electron microscope (TEM) observation, magnetic grain in the granular layer shows columnar structure, while Co/Pd multilayer shows continuous layer. The plane-view TEM image of the granular layer shows well-isolated grain structure with average grain size of around 6 nm, and grain-to-grain separation width of around 2 nm. Therefore, the interactions among the grains are negligible (J∼0). By depositing a continuous layer on a CoCrPt-SiO2 granular layer, the grains in the granular layer are magnetically coupled through capping layer that leads to the suppression of magnetic anisotropy dispersion. This CGC structure reduces the coercivity dispersion ( Δ Hc / Hc) from 0.26 to 0.15 and saturation field (Hs) from 10.4 to 6.7 kOe. The reduction of Hs and Δ Hc / Hc improves the OW by 21.3 dB. The small Δ Hc / Hc also maintains SNR of CGC media with strong magnetic exchange coupling. Furthermore, the coupling of grains through continuous layer enlarges the magnetic nucleation field (Hn) from 0.4 to -1.7 kOe. Consequently, CGC media shows better thermal stability compared to non-CGC media.

本文言語English
ページ(範囲)292-295
ページ数4
ジャーナルJournal of Magnetism and Magnetic Materials
303
2 SPEC. ISS.
DOI
出版ステータスPublished - 2006 8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
  • 凝縮系物理学

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