CoPtCr-SiO2 perpendicular media for high density recording with a high order magnetic anisotropy energy term

T. Shimatsu, H. Sato, T. Oikawa, K. Mitsuzuka, Y. Inaba, O. Kitakami, S. Okamoto, H. Aoi, H. Muraoka, Y. Nakamura

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

The first and second order energy terms of uniaxial magnetic anisotropy, Ku1 and Ku2, of CoPtCr-SiO2 perpendicular recording media were studied as a function of film composition and film structure. Moreover, the fabrication of CoPtCr-SiO2 media having adequate values of Ku1 and Ku2 for high recording density was preliminarily studied. An analysis of CoPtCr films with various kinds of seed layer materials revealed that the values of Ku1 and K u2 varied significantly with the seed layer material used, probably due to epitaxial growth of CoPtCr on the seed layers. Ku2 increased, accompanied by a reduction in Ku1 as the c/a ratio of the hcp-CoPtCr lattice increased. Moreover, experimental results suggest that a high stacking-fault density enhances the Ku2 values, especially in the high Pt content region. The addition of SiO2 reduces the total anisotropy, Ku1 + Ku2, but no significant change in the ratio of Ku2/Ku1 was observed. The fabrication of CoPtCr-SiO2 media with adequate values of Ku1 and K u2 was successfully demonstrated, although more intensive efforts to enhance grain isolation are required to confirm the advantages conferred by the Ku2 term.

Original languageEnglish
Pages (from-to)3175-3177
Number of pages3
JournalIEEE Transactions on Magnetics
Volume41
Issue number10
DOIs
Publication statusPublished - 2005 Oct

Keywords

  • CoPtCr-SiO
  • High order energy term
  • Lattice deformation
  • Magnetic anisotropy
  • Perpendicular recording media
  • Thermal stability

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering

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