Analysis of measured transport properties of domain walls in magnetic nanowires and films
Analysis of measured transport properties of domain walls in magnetic nanowires and films
复制标题
磁性纳米线和薄膜中磁畴壁传输特性的测量分析
DOI：
10.1103/physrevb.73.014407
复制
发表时间：
2005
影响因子：
3.7
通讯作者：
L. Berger
中科院分区：
文献类型：
--
作者：
L. Berger
现有的数据为软磁材料的临界电流畴壁运动，由磁场驱动的壁速度，和壁电阻，表明所有三个可观察到的属性是通过一个单一的参数：壁流动性$\mu$。$\mu$的倒数表示畴壁和导电电子气之间的粘性摩擦的强度。而$\mu$是壁宽的函数，而壁宽又取决于纵横比t/w，其中t和w是样品的厚度和宽度。超过四个数量级的$\mu$，纳米线的数据显示$\mu\propto（t/w）^{-2.2}$。这种依赖关系与1984年Berger理论基于s-d交换的预测近似一致。另一方面，这与2004年多田良和小野理论以及2004年张和李理论的预测不一致。
Existing data for soft magnetic materials of critical current for domain-wall motion, wall speed driven by a magnetic field, and wall electrical resistance, show that all three observable properties are related through a single parameter: the wall mobility $\mu$. The reciprocal of $\mu$ represents the strength of viscous friction between domain wall and conduction-electron gas. And $\mu$ is a function of the wall width, which depends in turn on the aspect ratio t/w, where t and w are the thickness and width of the sample. Over four orders of magnitude of $\mu$, the data for nanowires show $\mu\propto (t/w)^{-2.2}$. This dependence is in approximate agreement with the prediction of the 1984 Berger theory based on s-d exchange. On the other hand, it is inconsistent with the prediction of the 2004 Tatara and Kohno theory, and of the 2004 Zhang and Li theory.