Ferromagnetism and interlayer exchange coupling in short period (Ga,Mn)As/GaAs superlattices

Details Ferromagnetism and interlayer exchange coupling in short period (Ga,Mn)As/GaAs superlattices Ferromagnetism and interlayer exchange coupling in short period (Ga,Mn)As/GaAs superlattices

2002-06-19

arxiv.org/abs/cond-mat/0206380v1

Appl. Phys. Lett. 81, 3013 (2002)

Physics

Condensed Matter

Materials Science

REVTeX 4 style; 4 pages, 2 figures

Scientific paper

10.1063/1.1515368

Magnetic properties of (Ga,Mn)As/GaAs superlattices are investigated. The structures contain magnetic (Ga,Mn)As layers, separated by thin layers of non-magnetic GaAs spacer. The short period Ga$_{0.93}$Mn$_{0.07}$As/GaAs superlattices exhibit a paramagnetic-to-ferromagnetic phase transition close to 60K, for thicknesses of (Ga,Mn)As down to 23 \AA. For Ga$_{0.96}$Mn$_{0.04}$As/GaAs superlattices of similar dimensions, the Curie temperature associated with the ferromagnetic transition is found to oscillate with the thickness of non magnetic spacer. The observed oscillations are related to an interlayer exchange interaction mediated by the polarized holes of the (Ga,Mn)As layers.

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