Analysis of measured transport properties of domain walls in magnetic nanowires and films

被引:21
作者
Berger, L [1 ]
机构
[1] Carnegie Mellon Univ, Dept Phys, Pittsburgh, PA 15213 USA
来源
PHYSICAL REVIEW B | 2006年 / 73卷 / 01期
关键词
D O I
10.1103/PhysRevB.73.014407
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
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 proportional to(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.
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页数:5
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