Hysteresis and return-point memory in colloidal artificial spin ice systems.
Hysteresis and return-point memory in colloidal artificial spin ice systems.
复制标题
胶体人造自旋冰系统中的滞后和返回点记忆。
DOI：
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发表时间：
2011
期刊：
影响因子：
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通讯作者：
C. Reichhardt
中科院分区：
文献类型：
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作者：
A. Libál;C. Reichhardt;C. Reichhardt
使用计算机模拟，我们调查的磁滞回线和返回点记忆人工广场和戈薇自旋冰系统循环施加的偏置力和比较微观有效的自旋配置在整个磁滞循环。返回点记忆丧失是由戈薇冰中单个缺陷的运动或方形冰中晶界的运动引起的。在连续的循环中，返回点记忆在戈薇冰中迅速恢复。由于晶界的延伸性质，记忆在方冰中更逐渐地恢复。增加淬灭无序的量会增加缺陷密度，但也会增强返回点记忆，因为缺陷更容易被捕获。
Using computer simulations, we investigate hysteresis loops and return-point memory for artificial square and kagome spin ice systems by cycling an applied bias force and comparing microscopic effective spin configurations throughout the hysteresis cycle. Return-point memory loss is caused by motion of individual defects in kagome ice or of grain boundaries in square ice. In successive cycles, return-point memory is recovered rapidly in kagome ice. Memory is recovered more gradually in square ice due to the extended nature of the grain boundaries. Increasing the amount of quenched disorder increases the defect density but also enhances the return-point memory since the defects become trapped more easily.