Spin waves cause non-linear friction

被引：25
作者：
Magiera, M. P. [1 ,2 ]
Brendel, L. [1 ,2 ]
Wolf, D. E. [1 ,2 ]
Nowak, U. [3 ]
机构：
[1] Univ Duisburg Essen, Fac Phys, D-47048 Duisburg, Germany
[2] Univ Duisburg Essen, CeNIDE, D-47048 Duisburg, Germany
[3] Univ Konstanz, Dept Phys, D-78457 Constance, Germany
来源：
EPL | 2011年 / 95卷 / 01期
关键词：
D O I：
10.1209/0295-5075/95/17010
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
Energy dissipation is studied for a hard magnetic tip that scans a soft magnetic substrate. The dynamics of the atomic moments are simulated by solving the Landau-Lifshitz-Gilbert (LLG) equation numerically. The local energy currents are analysed for the case of a Heisenberg spin chain taken as substrate. This leads to an explanation for the velocity dependence of the friction force: The non-linear contribution for high velocities can be attributed to a spin wave front pushed by the tip along the substrate. Copyright (C) EPLA, 2011
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页数：6
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