High perpendicular magnetic anisotropy of CoPtCr/Ru films for granular-type perpendicular media

T. Shimatsu, Hideo Sato, T. Oikawa, Y. Inaba, Osamu Kitakami, S. Okamoto, H. Aoi, Hiroaki Muraoka, Y. Nakamura

Research output: Contribution to journalArticlepeer-review

45 Citations (Scopus)


The perpendicular magnetic anisotropy Ku of CoPtCr films deposited on Ru seed layers is discussed as a function of film composition. Moreover, the change in Ku by the addition of SiO2 is examined in light of thermal stability of CoPtCr-SiO2 media. The Ku of Co-10 at % Cr shows a high value of ∼ 5 × 10 6 erg/cm3, which is much higher than that reported by Bolzoni et al. The addition of Pt to the Co-10 at % Cr film results in a further enhancement of Ku. A maximum Ku of nearly 10 × 106 erg/cm3 is observed at 25 ∼ 30 at % Pt. All series of films with various Cr contents show maximum values of Ku at 25 ∼ 30 at % Pt. The maximum value for CoPt (Cr = 0) films reaches ∼ 15 × 106 erg/cm3. The value of magnetocrystalline anisotropy of grains Kug, calculated by taking account of the volume fraction of CoPtCr grains, decreases as the SiO2 content increases. However, the Kug maintains a large value of more than 7 × 106 erg/cm3, even at 10 at % SiO 2 in addition to (Co90Cr10)80Pt 20, which indicates a high potential of CoPtCr-SiO2 media to resist thermal agitation of magnetization.

Original languageEnglish
Pages (from-to)2483-2485
Number of pages3
JournalIEEE Transactions on Magnetics
Issue number4 II
Publication statusPublished - 2004 Jul


  • CoPtCr films
  • CoPtCr-SiO media
  • Perpendicular magnetic anisotropy
  • Ru seed layer
  • Thermal agitation of magnetization

ASJC Scopus subject areas

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


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