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

Abstract

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 Å. 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.

REVTeX 4 style; 4 pages, 2 figures

References in corpus (2)

• Structural and magnetic properties of GaMnAs layers with high Mn content grown by Migration Enhanced Epitaxy on GaAs(100) substrates
• Ferromagnetic GaMnAs/GaAs superlattices - MBE growth and magnetic properties

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• Quantum theory of tunneling magnetoresistance in GaMnAs/GaAs/GaMnAs heterostructures
• Impurity bands and the character of the electronic states in ferromagnetic GaMnAs layers
• A semiquantitative approach to the impurity-band-related transport properties of GaMnAs nanolayers
• Spin-polarized transport in ferromagnetic multilayered semiconductor nanostructures