Magnetic Reversal in Nanoscopic Ferromagnetic Rings

Details Magnetic Reversal in Nanoscopic Ferromagnetic Rings Magnetic Reversal in Nanoscopic Ferromagnetic Rings

2004-10-21

arxiv.org/abs/cond-mat/0410561v2

Phys. Rev. B 73, 054413 (2006)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

RevTeX, 23 pages, 7 figures, to appear in Phys. Rev. B

Scientific paper

10.1103/PhysRevB.73.054413

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 2D 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.

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