Microscopic mechanisms of magnetization reversal

Details Microscopic mechanisms of magnetization reversal Microscopic mechanisms of magnetization reversal

2004-01-28

arxiv.org/abs/cond-mat/0401590v1

Physics

Condensed Matter

Other Condensed Matter

Scientific paper

10.1063/1.1688681

Two principal scenarios of magnetization reversal are considered. In the first scenario all spins perform coherent motion and an excess of magnetic energy directly goes to a nonmagnetic thermal bath. A general dynamic equation is derived which includes a tensor damping term similar to the Bloch-Bloembergen form but the magnetization magnitude remains constant for any deviation from equilibrium. In the second reversal scenario, the absolute value of the averaged sample magnetization is decreased by a rapid excitation of nonlinear spin-wave resonances by uniform magnetization precession. We have developed an analytic k-space micromagnetic approach that describes this entire reversal process in an ultra-thin soft ferromagnetic film for up to 90^{o} deviation from equilibrium. Conditions for the occurrence of the two scenarios are discussed.

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