Magnetic Elements at Finite Temperature and Large Deviation Theory
作者： Robert V. Kohn , Maria G. Reznikoff , Eric Vanden-Eijnden , None
DOI: 10.1007/S00332-005-0671-Z
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摘要: We investigate thermally activated phenomena in micromagnetics using large deviation theory and concepts from stochastic resonance. give a natural mathematical definition of finite-temperature astroids, hysteresis loops, etc. Generically, these objects emerge when the (generalized) Arrhenius timescale governing barrier crossing event magnetic switching matches at which element is pulsed or ramped by an external field; special physically relevant case multiple-pulse experiments, on other hand, short-time can lead to non-Arrhenius behavior. show how be used explain some properties like their shrinking sharpening as number applied pulses increased. also influence dynamics, particular relative importance gyromagnetic damping terms. Finally, we discuss issues open questions regarding spatially nonuniform magnetization.
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