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Edge Domain Walls in Ultrathin Exchange-Biased Films

Research output: Contribution to journalArticle

Original languageEnglish
JournalJournal of Nonlinear Science
Early online date9 Jan 2020
DOIs
DateAccepted/In press - 17 Dec 2019
DateE-pub ahead of print (current) - 9 Jan 2020

Abstract

We present an analysis of edge domain walls in exchange-biased ferromagnetic films appearing as a result of a competition between the stray field at the film edges and the exchange bias field in the bulk. We introduce an effective two-dimensional micromagnetic energy that governs the magnetization behavior in exchange-biased materials and investigate its energy minimizers in the strip geometry. In a periodic setting, we provide a complete characterization of global energy minimizers corresponding to edge domain walls. In particular, we show that energy minimizers are one-dimensional and do not exhibit winding. We then consider a particular thin-film regime for large samples and relatively strong exchange bias and derive a simple and comprehensive algebraic model describing the limiting magnetization behavior in the interior and at the boundary of the sample. Finally, we demonstrate that the asymptotic results obtained in the periodic setting remain true in the case of finite rectangular samples.

    Research areas

  • Asymptotics, Charged domain walls, Energy minimizers, Micromagnetics

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