A set of topological arrangements of individual ferromagnetic islands in ideal and disordered artificial spin ice (ASI) arrays is investigated in order to evaluate how aspects of their field-driven reversal are affected by the model used. The set contains the pinwheel and square ice tilings, and thus a range of magnetic ordering and reversal properties are tested. It is found that a simple point dipole model performs relatively well for square ice, but it does not replicate the properties observed in recent experiments with pinwheel ice. Parameterization of the reversal barrier in a Stoner–Wohlfarth model improves upon this, but fails to capture aspects of the physics of ferromagnetic coupling observed in pinwheel structures which have been attributed to the non-Ising nature of the islands. In particular, spin canting is found to be important in pinwheel arrays, but not in square ones, due to their different symmetries. The authors' findings will improve the modeling of ASI structures for fundamental research and in applications which are reliant upon the ability to obtain and switch through known states using an externally applied field.

中文翻译：

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人工自旋冰中的场驱动反转模型

研究了理想和无序人工自旋冰 (ASI) 阵列中单个铁磁岛的一组拓扑排列，以评估所用模型如何影响其场驱动反转的各个方面。该组包含风车和方形冰块，因此测试了一系列磁性排序和反转特性。发现一个简单的点偶极子模型在方形冰上表现相对较好，但它不能复制在最近的风车冰实验中观察到的特性。Stoner-Wohlfarth 模型中反转势垒的参数化对此进行了改进，但未能捕获在风车结构中观察到的铁磁耦合物理方面，这归因于岛屿的非伊辛性质。特别是，发现自旋倾斜在风车阵列中很重要，但在方形阵列中不重要，因为它们的对称性不同。作者的发现将改进 ASI 结构的建模，用于基础研究和依赖于使用外部应用场获取和切换已知状态的能力的应用。