Physics – Condensed Matter – Statistical Mechanics
Scientific paper
2011-11-10
Phys. Rev. B 84, 212301 (2011)
Physics
Condensed Matter
Statistical Mechanics
4 pages, 3 figures
Scientific paper
10.1103/PhysRevB.84.212301
We demonstrate that in a ferromagnetic substrate, which is continuously driven out of equilibrium by a field moving with constant velocity $v$, at least two types of friction may occur when $v$ goes to zero: The substrate may feel a friction force proportional to $v$ (Stokes friction), if the field changes on a time scale which is longer than the intrinsic relaxation time. On the other hand, the friction force may become independent of $v$ in the opposite case (Coulomb friction). These observations are analogous to e.g. solid friction. The effect is demonstrated in both, the Ising (one spin dimension) and the Heisenberg model (three spin dimensions), irrespective which kind of dynamics (Metropolis spin-flip dynamics or Landau-Lifshitz-Gilbert precessional dynamics) is used. For both models the limiting case of Coulomb friction can be treated analytically. Furthermore we present an empiric expression reflecting the correct Stokes behavior and therefore yielding the correct cross-over velocity and dissipation.
Angst Sebastian
Hucht Alfred
Magiera Martin P.
Wolf Dietrich E.
No associations
LandOfFree
Magnetic friction: From Stokes to Coulomb behavior does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Magnetic friction: From Stokes to Coulomb behavior, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Magnetic friction: From Stokes to Coulomb behavior will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-727900