Magnetic reversal in nanoscopic ferromagnetic rings

Kirsten Martens, D. L. Stein, A. D. Kent

    Research output: Contribution to journalArticle

    Abstract

    We present a theory of magnetization reversal due to thermal fluctuations in thin submicron-scale rings composed of soft magnetic materials. The magnetization in such geometries is more stable against reversal than that in thin needles and other geometries, where sharp ends or edges can initiate nucleation of a reversed state. The two-dimensional ring geometry also allows us to evaluate the effects of nonlocal magnetostatic forces. We find a "phase transition," which should be experimentally observable, between an Arrhenius and a non-Arrhenius activation regime as magnetic field is varied in a ring of fixed size.

    Original languageEnglish (US)
    Article number054413
    JournalPhysical Review B - Condensed Matter and Materials Physics
    Volume73
    Issue number5
    DOIs
    StatePublished - 2006

    Fingerprint

    Geometry
    rings
    geometry
    Soft magnetic materials
    Magnetization reversal
    magnetization
    Magnetostatics
    magnetostatics
    magnetic materials
    needles
    Needles
    Magnetization
    Nucleation
    Phase transitions
    Chemical activation
    nucleation
    activation
    Magnetic fields
    magnetic fields
    Hot Temperature

    ASJC Scopus subject areas

    • Condensed Matter Physics

    Cite this

    Magnetic reversal in nanoscopic ferromagnetic rings. / Martens, Kirsten; Stein, D. L.; Kent, A. D.

    In: Physical Review B - Condensed Matter and Materials Physics, Vol. 73, No. 5, 054413, 2006.

    Research output: Contribution to journalArticle

    Martens, Kirsten ; Stein, D. L. ; Kent, A. D. / Magnetic reversal in nanoscopic ferromagnetic rings. In: Physical Review B - Condensed Matter and Materials Physics. 2006 ; Vol. 73, No. 5.
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