Dynamics of artificial spin ice: a continuous honeycomb network
Dynamics of artificial spin ice: a continuous honeycomb network
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DOI：
10.1088/1367-2630/14/3/035022
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发表时间：
2012-03-30
影响因子：
3.3
通讯作者：
Tchernyshyov, Oleg
中科院分区：
文献类型：
--
作者：
Shen, Yichen;Petrova, Olga;Tchernyshyov, Oleg
我们在旋转冰的人工模拟中模拟磁化动力学，专门用于连接磁性纳米线的蜂窝网络的情况。固有的耗散动力学是由晶格位点中畴壁的发射和吸收及其在其链接中的传播来介导的。这些畴壁携带两个自然单位的磁荷，而晶格的位点包含一个单位磁荷。这些电荷之间的静磁库仑力在系统的物理过程中起着重要作用，晶格缺陷引起的猝灭无序也起着重要作用。我们识别并描述了外加磁场中磁化反转的不同状态，该磁场由外加磁场相对于初始磁化的方向确定。其中一种状态的特征是具有 1/n 长度分布的磁雪崩。
We model the dynamics of magnetization in an artificial analogue of spin ice specializing to the case of a honeycomb network of connected magnetic nanowires. The inherently dissipative dynamics is mediated by the emission and absorption of domain walls in the sites of the lattice, and their propagation in its links. These domain walls carry two natural units of magnetic charge, whereas sites of the lattice contain a unit magnetic charge. Magnetostatic Coulomb forces between these charges play a major role in the physics of the system, as does quenched disorder caused by imperfections of the lattice. We identify and describe different regimes of magnetization reversal in an applied magnetic field determined by the orientation of the applied field with respect to the initial magnetization. One of the regimes is characterized by magnetic avalanches with a 1/n distribution of lengths.