Effect of underlayers on magnetic properties of Co/Pd multilayer perpendicular magnetic recording media

T. Onoue, J. Kawaji, K. Kuramochi, T. Asahi, T. Osaka

Research output: Contribution to journalConference articlepeer-review

17 Citations (Scopus)

Abstract

Amorphous C and Si films were sputter-deposited as underlayers of Co/Pd multilayer perpendicular magnetic recording media. The magnetic properties of the media were significantly affected by the underlayer thickness; namely, the values of coercivity Hc and nucleation field -Hn increased and the value of α decreased with merely increasing the thickness of C or Si underlayer, where α is the derivative of M-H loop at the value of coercivity. The coercivity was not always affected by magnetic anisotropy constant Ku for the Co/Pd media. In read-write experiments, the higher S/N ratio was obtained for the media with the thicker C or Si underlayer, which exhibited low α and high Hc. In the time decay experiments of magnetization, the Co/Pd multilayer media with C or Si underlayer possessed good thermal stability. This study demonstrated that the introduction of C or Si underlayer greatly improves magnetic properties, read-write characteristics, and thermal stability of Co/Pd multilayer perpendicular magnetic recording media.

Original languageEnglish
Pages (from-to)82-86
Number of pages5
JournalJournal of Magnetism and Magnetic Materials
Volume235
Issue number1-3
DOIs
Publication statusPublished - 2001 Oct 1
EventProceedings of the 5th Perpendicular Magnetic Recording Conference (PMRC 2000) - Sendai, Japan
Duration: 2000 Oct 232000 Oct 26

Keywords

  • Multilayers
  • Perpendicular magnetic recording
  • Underlayers

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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