论文标题
人造方形冰冰的集体铁磁
Collective ferromagnetism of artificial square spin ice
论文作者
论文摘要
我们已经研究了大面积的人造方形自旋冰阵列的总磁矩的温度和磁场依赖性。温度依赖性和磁滞行为与Stoner-Wohlfarth模型中预期的相干磁化反转一致，这是由于小晶格间距处的岛间相互作用而引起的明显偏差。通过微磁模拟，我们探索了这种行为，并证明了偏差是由于小晶格间距的越来越复杂的磁化逆转而引起的，这是由岛间相互作用引起的，并且取决于岛形状的细节。这些结果建立了新的手段，以调整人造自旋冰结构的物理特性和其他相互作用的纳米磁体系统，例如图案化的磁介质。
We have studied 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 inter-island 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 inter-island 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.
