Thonig D, Reißaus S, Mertig I, Henk J
J Phys Condens Matter. 2014 Jul 2;26(26):266006. doi: 10.1088/0953-8984/26/26/266006.
We report on a theoretical investigation of artificial spin-ice dipolar arrays using a nanoisland shape adopted from recent experiments (Farhan et al 2013 Nature Phys. 9 375). The number of thermal magnetic string excitations in the square lattice is drastically increased by a vertical displacement of rows and columns. We find large increments especially for low temperatures and for string excitations with quasi-monopoles of charges ± 4. By kinetic Monte Carlo simulations we address the thermal stability of such excitations, thereby providing time scales for their experimental observation.
我们报告了一项关于人工自旋冰偶极阵列的理论研究，该研究采用了近期实验（法尔汉等人，《自然·物理学》，2013年，第9卷，第375页）中的纳米岛形状。通过行和列的垂直位移，方形晶格中热磁弦激发的数量急剧增加。我们发现，特别是在低温以及电荷为±4的准单极子的弦激发情况下，增加幅度很大。通过动力学蒙特卡罗模拟，我们研究了此类激发的热稳定性，从而为其实验观测提供了时间尺度。
