Effect of thermal fluctuations on switching field of deep submicron sized soft magnetic thin film

Kyoung Jin Lee, T. D. Lee

Research output: Contribution to journalArticle

3 Citations (Scopus)


In this article, the effect of thermal fluctuations on switching field at short and long time scales have been investigated by micromagnetic simulation with the Langevin and the time-temperature scaling methods. When the film thickness and/or the aspect ratio are reduced, the switching field decreases substantially owing to the decrease of shape anisotropy and the increase of thermal fluctuation. In the soft magnetic film with a dimension of 0.4μm×0.2μm×1nm, the calculated switching field at a pulse width of 10 ns is 32 Oe, but estimated retention time is less than 1000 s. In such a thermally unstable film, thermally activated switching of magnetization occurs by complex behaviors with creations and annihilations of small and slightly tilted magnetic clusters.

Original languageEnglish
Pages (from-to)7706-7708
Number of pages3
JournalJournal of Applied Physics
Issue number10 I
Publication statusPublished - 2002 May 15
Externally publishedYes


ASJC Scopus subject areas

  • Physics and Astronomy(all)

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