Issue |
EPL
Volume 95, Number 1, July 2011
|
|
---|---|---|
Article Number | 17010 | |
Number of page(s) | 6 | |
Section | Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties | |
DOI | https://doi.org/10.1209/0295-5075/95/17010 | |
Published online | 23 June 2011 |
Spin waves cause non-linear friction
1
Faculty of Physics and CeNIDE, University of Duisburg-Essen - D-47048 Duisburg, Germany, EU
2
Department of Physics, University of Konstanz - D-78457 Konstanz, Germany, EU
Received:
1
April
2011
Accepted:
23
May
2011
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.
PACS: 75.10.Hk – Classical spin models / 68.35.Af – Atomic scale friction / 75.30.Ds – Spin waves
© EPLA, 2011
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