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

R. Mathieu; P. Svedlindh; J. Sadowski; K. Swiatek; M. Karlsteen; J. Kanski; L. Ilver

doi:10.1063/1.1515368

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

Materials Science 2009-11-07 v1

Authors: R. Mathieu , P. Svedlindh , J. Sadowski , K. Swiatek , M. Karlsteen , J. Kanski , L. Ilver

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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 \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.

Keywords

ferromagnetism interlayer exchange coupling superlattice GaMnAs Curie temperature

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@article{arxiv.cond-mat/0206380,
  title  = {Ferromagnetism and interlayer exchange coupling in short period (Ga,Mn)As/GaAs superlattices},
  author = {R. Mathieu and P. Svedlindh and J. Sadowski and K. Swiatek and M. Karlsteen and J. Kanski and L. Ilver},
  journal= {arXiv preprint arXiv:cond-mat/0206380},
  year   = {2009}
}

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

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