Eddy current damping of a moving domain wall: beyond the quasistatic approximation
arXiv:0706.2122 · doi:10.1103/PhysRevB.76.224416
Abstract
In conducting ferromagnetic materials, a moving domain wall induces eddy currents in the sample which give rise to an effective retarding pressure on the domain wall. We show here that the pressure is not just proportional to the instantaneous velocity of the wall, as often assumed in domain wall models, but depends on the history of the motion. We calculate the retarding pressure by solving the Maxwell equations for the field generated by the eddy currents, and show how its effect can be accounted for by associating a negative effective mass to the magnetic wall. We analyze the dependence of this effect on the sample geometry and discuss the implications for Barkhausen noise measurements.
arXiv comment9 pages, 4 figures, submitted to Phys. Rev. B
References in corpus (5)
- Crackling Noise
- Dynamics of a ferromagnetic domain wall: avalanches, depinning transition and the Barkhausen effect
- Signature of effective mass in crackling noise asymmetry
- Universal Pulse Shape Scaling Function and Exponents: A Critical Test for Avalanche Models applied to Barkhausen Noise
- Shape of a Barkhausen pulse
Cited by in corpus (4)
- Exactly solvable model of avalanches dynamics for Barkhausen crackling noise
- Statistics of Avalanches with Relaxation, and Barkhausen Noise: A Solvable Model
- Field theory of disordered systems -- Avalanches of an elastic interface in a random medium
- Magnetic domain dynamics in an insulating quantum ferromagnet