CSO, Seoul National University, Republic of Korea.
Phys Rev Lett. 2011 Aug 5;107(6):067201. doi: 10.1103/PhysRevLett.107.067201. Epub 2011 Aug 1.
We examine magnetic domain wall motion in metallic nanowires Pt-Co-Pt. Regardless of whether the motion is driven by either magnetic fields or current, all experimental data fall onto a single universal curve in the creep regime, implying that both the motions belong to the same universality class. This result is in contrast to the report on magnetic semiconductor (Ga,Mn)As exhibiting two different universality classes. Our finding signals the possible existence of yet other universality classes which go beyond the present understanding of the statistical mechanics of driven interfaces.
我们研究了 Pt-Co-Pt 金属纳米线中的磁畴壁运动。无论运动是由磁场还是电流驱动，所有实验数据在蠕变区都落在单个通用曲线上，这意味着这两种运动都属于同一类普遍性。这一结果与关于半导体（Ga，Mn）As 表现出两种不同的普遍性类别的报告形成对比。我们的发现表明，可能存在其他超越现有驱动界面统计力学理解的普遍性类别。
