模拟Fe纳米柱中双峰开关时间分布的分辨率依赖机制
Resolution-dependent mechanisms for bimodal switching-time distributions in simulated Fe nanopillars
摘要：
我们研究了三个独立的计算模型，代表同一个物理系统，铁纳米柱的磁化开关统计反转的应用领域。模型之间的主要区别是计算网格的分辨率，因此，必须重新调整内部参数以保持与物理系统的相似性。考虑到在纵向（易轴）方向上的磁化分量的第一次通过时间为零，我们寻找应用领域，导致双峰分布的时间为每个系统，并比较实验系统的结果。我们观察到，导致双峰分布的相关波动对于每个晶格分辨率是不同的，并且导致每个计算模型所特有的磁化切换行为。因此，正确的模型分辨率是必不可少的系统动力学获得可靠的数值结果。
英文摘要：
We study the magnetization-switching statistics following reversal of the applied field for three separate computational models representing the same physical system, an iron nanopillar. The primary difference between the models is the resolution of the computational lattice and, consequently, the intrinsic parameters that must be rescaled to retain similarity to the physical system. Considering the first-passage time to zero for the magnetization component in the longitudinal (easy-axis) direction, we look for applied fields that result in bimodal distributions of this time for each system and compare the results to the experimental system. We observe that the relevant fluctuations leading to bimodal distributions are different for each lattice resolution and result in magnetization-switching behavior that is unique to each computational model. Correct model resolution is thus essential for obtaining reliable numerical results for the system dynamics.
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