Improvement of magnetic properties and read/write characteristics in SmCo5 perpendicular thin films

Toru Asahi, Isao Koizumi, Yuta Kikuchi, Masahiro Yoshino, Atsushi Sugiyama, Jiro Hokkyo, Tetsuya Osaka*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


An SmCo5 alloy is a promising candidate for ultra-high density magnetic recording media because of its strong uniaxial magnetocrystalline anisotropy, whose constant, Ku, is more than 1.1×108 erg/cm3. Recently, we successfully obtained high perpendicular magnetic anisotropy for a sputter-deposited SmCo5 thin film by introducing a Cu/Ti dual underlayer. However, it is necessary to improve magnetic properties and read/write (R/W) characteristics for applying SmCo5 thin films to perpendicular magnetic recording media. In this study, we focused on reduction of magnetic domain size and change of a magnetization reversal process of SmCo5 perpendicular magnetic thin films by introducing carbon (C) atoms into the constituent Cu underlayer. The magnetic domain size became small and the ratio of coercivity (Hc) against magnetic anisotropy (Hk) which is an index of the magnetization reversal process was increased by adding C atoms. We also evaluated the R/W characteristics of SmCo5 double-layered media including C atoms. The medium noise was decreased and signal-to-noise ratio increased by introducing the C. The addition of C into the Cu underlayer is effective for changing the magnetization reversal process, reducing medium noise and increasing SNR.

Original languageEnglish
Pages (from-to)3075-3078
Number of pages4
JournalJournal of Magnetism and Magnetic Materials
Issue number22
Publication statusPublished - 2008 Nov


  • Carbon addition
  • High K
  • Perpendicular magnetic anisotropy
  • Read/write(R/W) characteristics
  • SmCo thin film

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics


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