Abstract
Zero and finite temperature micromagnetic studies have been performed for two nanoscale structures of different geometries by means of numerical integration of the deterministic and stochastic Landau-Lifshitz-Gilbert equations of motion. The results indicate that not only do thermal fluctuations cause a decrease of the coercivity and the time scales involved in switching, but they can also alter the magnetization reversal path. In the case of thermally induced changes in the switching path it is found that with sufficient thermal energy the particle can form other states prior to switching than in the deterministic model. This leads to the identification of two switching regimes in the structures considered, whereby switching from one of the states significantly decreases the coercivity. Furthermore, a study of the time scales involved and the transient magnetic configurations appearing during fast switching was performed.
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