Experimental determination of domain wall width and spin stiffness constant in ferromagnetic (Ga,Mn)As with perpendicular easy axis

A. Dourlat (1) , C. Gourdon (1) , V. Jeudy (1) , K. Khazen , H. J. Von Bardeleben (1) , L. Thevenard (1) , Aristide Lemaitre (2)

1 INSP - Institut des Nanosciences de Paris
2 LPN - Laboratoire de photonique et de nanostructures

The magnetic domain structure and hysteresis cycles of (Ga,Mn)As are investigated using magneto-optical imaging. The anisotropy constants and the magnetization are obtained from ferromagnetic resonance and SQUID magnetometry measurements, respectively. The experimental data are analyzed using domain theory for ferromagnetic films with strong uniaxial anisotropy. We obtain lower and upper boundaries for the micromagnetic parameters: the domain wall specific energy, the domain wall width and the spin stiffness constant. (c) 2007 Elsevier B.V. All rights reserved.

Mots clés: magnetic semiconductor; GaMnAs; domains; spin stiffness; domain wall width; domain wall energy; magneto-optical Kerr effect; ferromagnetic resonance

Domaines: Matière Condensée [cond-mat]

A. Dourlat, C. Gourdon, V. Jeudy, K. Khazen, H. J. Von Bardeleben, et al.. Experimental determination of domain wall width and spin stiffness constant in ferromagnetic (Ga,Mn)As with perpendicular easy axis. Physica E: Low-dimensional Systems and Nanostructures, 2008, 40 (6), pp.1848-1850. ⟨10.1016/j.physe.2007.08.037⟩. ⟨hal-01287869⟩