Physics – Condensed Matter – Statistical Mechanics
Scientific paper
2007-05-30
J. Phys.: Condens. Matter 22 (2010) 236001
Physics
Condensed Matter
Statistical Mechanics
19 pages, 7 figures
Scientific paper
Finite-temperature micromagnetics simulations are employed to study the magnetization-switching dynamics driven by a field applied at an angle to the long axis of an iron nanopillar. A bi-modal distribution in the switching times is observed, and evidence for two competing modes of magnetization-switching dynamics is presented. For the conditions studied here, temperature $T = 20$ K and the reversal field 3160 Oe at an angle of 75$^\circ$ to the long axis, approximately 70% of the switches involve unstable decay (no free-energy barrier) and 30% involve metastable decay (a free-energy barrier is crossed). The latter are indistinguishable from switches which are constrained to start at a metastable free-energy minimum. Competition between unstable and metastable decay could greatly complicate applications involving magnetization switches near the coercive field.
Brown Garfield
Novotny Mark A.
Rikvold Per Arne
Thompson Heather S.
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