Under a magnetic field along its axis, domain wall motion in a uniaxial nanowire is much slower than in the fully anisotropic case, typically by several orders of magnitude (the square of the dimensionless Gilbert damping parameter). However, with the addition of a magnetic field transverse to the wire, this behaviour is dramatically reversed; up to a critical field strength, analogous to the Walker breakdown field, domain walls in a uniaxial wire propagate faster than in a fully anisotropic wire (without transverse field). Beyond this critical field strength, precessional motion sets in, and the mean velocity decreases. Our results are based on leading-order analytic calculations of the velocity and critical field as well as numerical solutions of the Landau-Lifshitz-Gilbert equation.
@article{arxiv.1206.4819,
title = {Fast domain wall propagation in uniaxial nanowires with transverse fields},
author = {Arseni Goussev and Ross G. Lund and J. M. Robbins and Valeriy Slastikov and Charles Sonnenberg},
journal= {arXiv preprint arXiv:1206.4819},
year = {2013}
}