Stochastic simulation of thermally assisted magnetization reversal in sub-100 nm dots with perpendicular anisotropy

Budi Purnama, Masashi Koga, Yukio Nozaki, Kimihide Matsuyama

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

Thermally assisted magnetization reversal of sub-100 nm dots with perpendicular anisotropy has been investigated using a micromagnetic Langevin model. The performance of the two different reversal modes of (i) a reduced barrier writing scheme and (ii) a Curie point writing scheme are compared. For the reduced barrier writing scheme, the switching field Hswt decreases with an increase in writing temperature but is still larger than that of the Curie point writing scheme. For the Curie point writing scheme, the required threshold field Hth, evaluated from 50 simulation results, saturates at a value, which is not simply related to the energy barrier height. The value of Hth increases with a decrease in cooling time owing to the dynamic aspects of the magnetic ordering process. Dependence of Hth on material parameters and dot sizes has been systematically studied.

Original languageEnglish
Pages (from-to)1325-1330
Number of pages6
JournalJournal of Magnetism and Magnetic Materials
Volume321
Issue number9
DOIs
Publication statusPublished - 2009 May 1
Externally publishedYes

Keywords

  • Curie point writing
  • Perpendicular anisotropy
  • Reduced barrier writing
  • Thermally assisted magnetization reversal

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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