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Micromagnetic study of magnetization reversal in ferromagnetic nanorings

机译：铁磁纳米环中磁化反转的微磁研究

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摘要

We present results of micromagnetic simulations of thin ferromagnetic rings undergoing magnetization reversal. This geometry is one of few examples in micromagnetics in which the transition states have been found analytically in a one-dimensional (ID) model. According to this model, at low lields and large ring sizes. the energetically preferred transition state is a localized magnetization fluctuation (instanton saddle). At high fields and small ring size, the preferred saddle state is a uniformly rotated magnetization (constant saddle). In the first part of this paper, we use numerical micromagnetic simulations to test these predictions of the ID analytical model for more realistic situations including a variety of ring radii, annular widths and magnetic fields. The predicted activation energies for magnetization reversal are found to be in close agreement with numerical results even for rings with a large annular width where the ID approximation would be expected to break down. We find that this approximation breaks down only when the ring's annular width exceeds its radius. In the second part, we present new metastable states found in the large radius limit and discuss how they provide a more complete understanding of the energy landscape of magnetic nanorings.
机译：我们介绍了经历磁化反转的薄铁磁环的微磁模拟结果。这种几何形状是微磁学中为数不多的几个例子之一，在这些例子中，在一维（ID）模型中已分析地找到了过渡态。根据该模型，产量低且环尺寸大。能量上优选的过渡态是局部磁化波动（instanton鞍座）。在高磁场和小环尺寸的情况下，首选的鞍状状态是均匀旋转的磁化强度（恒定鞍状）。在本文的第一部分中，我们使用数值微磁模拟来测试ID分析模型的这些预测，以用于更实际的情况，包括各种环半径，环形宽度和磁场。发现对于磁化反转的预测活化能与数值结果也非常吻合，即使对于环形宽度大的环，其中ID近似值可能会下降。我们发现，只有当环的环形宽度超过其半径时，这种近似才会分解。在第二部分中，我们介绍了在大半径范围内发现的新的亚稳态，并讨论了它们如何提供对磁性纳米环能量分布的更完整的理解。

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