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Determination of the micromagnetic parameters in (Ga,Mn)As using domain theory

C. Gourdon, A. Dourlat, V. Jeudy, K. Khazen, H. J. von Bardeleben, L. Thevenard, and A. Lemaître
Phys. Rev. B 76, 241301(R) – Published 6 December 2007

Abstract

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.

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  • Received 1 October 2007

DOI:https://doi.org/10.1103/PhysRevB.76.241301

©2007 American Physical Society

Authors & Affiliations

C. Gourdon*, A. Dourlat, V. Jeudy, K. Khazen, and H. J. von Bardeleben

  • Institut des Nanosciences de Paris, Université Pierre et Marie Curie—Paris 6, CNRS, UMR 7588, 140 rue de Lourmel, 75015 Paris, France

L. Thevenard and A. Lemaître

  • Laboratoire de Photonique et Nanostructures, CNRS, UPR 20, Route de Nozay, 91460 Marcoussis, France

  • *catherine.gourdon@insp.jussieu.fr; web site: http://www.insp.upmc.fr

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Issue

Vol. 76, Iss. 24 — 15 December 2007

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