The magnetic domain structure and magnetic properties of a ferromagnetic (Ga,Mn)As epilayer with perpendicular magnetic easy-axis are investigated. We show that, despite strong hysteresis, domain theory at thermodynamical equilibrium can be used to determine the micromagnetic parameters. Combining magneto-optical Kerr microscopy, magnetometry and ferromagnetic resonance measurements, we obtain the characteristic parameter for magnetic domains λc, the domain wall width and specific energy, and the spin stiffness constant as a function of temperature. The nucleation barrier for magnetization reversal and the Walker breakdown velocity for field-driven domain wall propagation are also estimated.
@article{arxiv.0710.0479,
title = {Determination of the micromagnetic parameters in (Ga,Mn)As using domain theory},
author = {Catherine Gourdon and Alexandre Dourlat and Vincent Jeudy and Khashayar Khazen and Hans Jürgen Von Bardeleben and Laura Thevenard and Aristide Lemaître},
journal= {arXiv preprint arXiv:0710.0479},
year = {2010}
}