Thermal stability in perpendicular recording media

Takehito Shimatsu, Hiroyuki Uwazumi, Hiroaki Muraoka, Yoshihisa Nakamura

研究成果: Conference article査読

28 被引用数 (Scopus)

抄録

Magnetic and structural properties of CoCrPt based perpendicular recording media required to achieve both high thermal stability and low-noise performance are discussed, based on experimental results obtained using a pulse magnetometer. Experimental and theoretical analysis reveal that for CoCrPt based media of 20nm thickness having the thermal stability factor KuV/(kT)≈80, the maximum achievable value of the ratio of remanence coercivity to anisotropy field of grains, Hr/Hk is ∼0.35. Furthermore, in order to realize a large squareness Mr/Ms of nearly 1.0, which is required to resist the thermal agitation effect at low recording density, we find that the value of perpendicular magnetocrystalline anisotropy, Ku needed to be more than three times larger than 2πMs2. X-ray diffraction patterns suggested that the suppression of structural imperfections in the HCP structure, particularly in the initial growth layer, is the key issue to induce larger Ku value in the CoCrPt based media.

本文言語English
ページ(範囲)273-280
ページ数8
ジャーナルJournal of Magnetism and Magnetic Materials
235
1-3
DOI
出版ステータスPublished - 2001 10月
イベントProceedings of the 5th Perpendicular Magnetic Recording Conference (PMRC 2000) - Sendai, Japan
継続期間: 2000 10月 232000 10月 26

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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