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arXiv 1006.4075cond-mat.mtrl-sci
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人工自旋冰中磁荷的动力学

Dynamics of magnetic charges in artificial spin ice

Paula Mellado, Olga Petrova, Yichen Shen, Oleg Tchernyshyov

摘要:

人工自旋冰最近已经在介观磁线的二维阵列中实现。我们提出了一个人工自旋冰在外加磁场作用下磁化动力学的理论模型。磁化反转由携带两个单位磁荷的畴壁介导。当局部磁场超过一个临界值$H_c$时,晶格结就会发射出这种磁场,而这个临界值是拉开符号相反的磁荷所必需的。磁荷间库仑相互作用的正反馈在磁化反转中诱发雪崩。

英文摘要:

Artificial spin ice has been recently implemented in two-dimensional arrays of mesoscopic magnetic wires. We propose a theoretical model of magnetization dynamics in artificial spin ice under the action of an applied magnetic field. Magnetization reversal is mediated by domain walls carrying two units of magnetic charge. They are emitted by lattice junctions when the the local field exceeds a critical value $H_c$ required to pull apart magnetic charges of opposite sign. Positive feedback from Coulomb interactions between magnetic charges induces avalanches in magnetization reversal.

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