Collective Ferromagnetism of Artificial Square Spin Ice
Collective Ferromagnetism of Artificial Square Spin Ice
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DOI：
10.1103/physrevlett.129.067201
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发表时间：
2022-08-05
影响因子：
8.6
通讯作者：
Schiffer, P.
中科院分区：
文献类型：
--
作者：
Bingham, N. S.;Zhang, X.;Schiffer, P.
研究了大面积坡莫合金人工正方形自旋冰阵列的总磁矩随温度和磁场的变化关系。的温度依赖性和滞后行为是一致的相干磁化反转中预期的Stoner-Wohlfarth模型，具有明显的偏差，由于在小的晶格间距的相互作用。通过微磁模拟，我们探索这种行为，并证明了偏差的结果越来越复杂的磁化反转在小的晶格间距，诱导的相互作用，并严格依赖于岛的形状的细节。这些结果建立了新的手段来调整人工自旋冰结构和其他相互作用的纳米磁体系统，如图案化的磁介质的物理特性。
We study the temperature and magnetic field dependence of the total magnetic moment of large-area permalloy artificial square spin ice arrays. The temperature dependence and hysteresis behavior are consistent with the coherent magnetization reversal expected in the Stoner-Wohlfarth model, with clear deviations due to interisland interactions at small lattice spacing. Through micromagnetic simulations, we explore this behavior and demonstrate that the deviations result from increasingly complex magnetization reversal at small lattice spacing, induced by interisland interactions, and depending critically on details of the island shapes. These results establish new means to tune the physical properties of artificial spin ice structures and other interacting nanomagnet systems, such as patterned magnetic media.