Thermal effects in the high-speed switching of the magnetization of fine grains

Andreas Lyberatos, Sakhrat Khizroev, Dmitri Litvinov

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

A numerical study of thermal effects on the high-speed switching of the magnetization of perpendicular recording media is presented. The Langevin equation is solved numerically to determine the magnetic response of a single grain during motion through the field profile of a single pole head. We evaluate the effective time of the thermal relaxation process and the thermal reduction of the write coercivity. A transition from thermally activated to dynamic reversal occurs at some critical value v1 of the relative head-medium velocity. In the thermal regime (v < v1), the gyromagnetic precession enhances the energy barrier of reversal. In the dynamic reversal regime (v > v1), the thermal reduction of the write coercivity is independent of the velocity.

Original languageEnglish (US)
Pages (from-to)1598-1602
Number of pages5
JournalJapanese Journal of Applied Physics, Part 1: Regular Papers & Short Notes
Volume42
Issue number4 A
DOIs
StatePublished - Apr 2003
Externally publishedYes

Keywords

  • High-speed switching
  • Magnetic recording thin films
  • Perpendicular recording
  • Thermal effects

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)

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