论文标题
能源障碍降低对平方人造自旋冰中集体激发的依赖性：模拟技术的全面比较
Dependence of energy barrier reduction on collective excitations in square artificial spin ice: A comprehensive comparison of simulation techniques
论文作者
论文摘要
我们执行微磁模拟，以研究由布置在平方晶格上的细长单域磁岛组成的正方形人造自旋冰系统中的开关屏障。通过考虑由一个中央岛和六个最近的邻居岛组成的双顶点，我们通过应用弦方法来计算两种类型的双顶点之间的能屏障。我们通过微磁模拟调查了相邻岛屿的后果，岛屿磁化的不均匀性以及能量屏障的逆转机制，通过将三种不同的方法与增加的复杂性进行比较。将应用字符串方法的微磁模型与当前常见方法（平均屏障近似）进行了比较。我们的研究表明，与平均蜂 - 近似相比，转换过程的适当微磁建模导致较低的能屏障，高达35％，因此将预期的平均寿命降低到七个数量级。在此，我们研究了并行切换通道的影响以及使用平均级级计算相应速率的概念方法。
We perform micromagnetic simulations to study the switching barriers in square artificial spin ice systems consisting of elongated single domain magnetic islands arranged on a square lattice. By considering a double vertex composed of one central island and six nearest neighbor islands, we calculate the energy barriers between two types of double vertices by applying the string method. We investigate by means of micromagnetic simulations the consequences of the neighboring islands, the inhomogeneities in the magnetization of the islands and the reversal mechanisms on the energy barrier by comparing three different approaches with increasing complexity. The micromagnetic models, where the string method is applied, are compared to the currently common method, the mean barrier approximation. Our investigations indicate that a proper micromagnetic modeling of the switching process leads to significantly lower energy barriers, by up to 35% compared to the mean-barrier approximation, so decreasing the expected average life time up to seven orders of magnitude. Hereby, we investigate the influence of parallel switching channels and the conceptional approach of using a mean-barrier to calculate the corresponding rates.
