Spin waves cause non-linear friction
Martin P. Magiera, Lothar Brendel, Dietrich E. Wolf, Ulrich Nowak
TL;DR
This paper investigates how spin waves contribute to non-linear friction forces when a magnetic tip scans a magnetic substrate, revealing velocity-dependent energy dissipation mechanisms through numerical simulations.
Contribution
It introduces a detailed simulation approach linking spin wave dynamics to non-linear friction, providing new insights into magnetic energy dissipation mechanisms.
Findings
Spin waves cause non-linear friction at high velocities.
Velocity dependence of friction is explained by spin wave fronts.
Energy dissipation is linked to spin wave propagation along the substrate.
Abstract
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.
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