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摘要翻译：
本文采用有限温度微磁学模拟方法，研究了在与铁纳米柱长轴成一定角度的磁场驱动下的磁化开关动力学。观察到了开关时间的双模分布，并给出了磁化-开关动力学的两种竞争模式的证据。在温度$T=20$K和反向场3160Oe与长轴成75角的条件下，大约70%的开关涉及不稳定衰变（无自由能垒），30%涉及亚稳态衰变（有自由能垒）。后者与受限于亚稳态自由能最小值启动的开关没有什么区别。不稳定衰变和亚稳衰变之间的竞争会使矫顽场附近的磁化开关应用变得非常复杂。
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英文标题：
《Two Modes of Magnetization Switching in a Simulated Iron Nanopillar in
an Obliquely Oriented Field》
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作者：
S.H. Thompson, G. Brown, P.A. Rikvold, M.A. Novotny
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最新提交年份：
2007
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分类信息：
一级分类：Physics 物理学
二级分类：Statistical Mechanics 统计力学
分类描述：Phase transitions, thermodynamics, field theory, non-equilibrium phenomena, renormalization group and scaling, integrable models, turbulence
相变，热力学，场论，非平衡现象，重整化群和标度，可积模型，湍流
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英文摘要：
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.
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PDF链接：
https://arxiv.org/pdf/705.4454
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