Magneto-transport measurements of ferromagnetic MnAs epilayers grown by molecular beam epitaxy reveal the presence of both positive and negative charge carriers. Electrical transport at high temperatures is dominated by holes, and at low temperatures by electrons. We also observe distinct changes in the magnetoresistance associated with the transition between the electron- and hole-dominated transport regimes. These results are of direct relevance to MnAs/semiconductor hybrid heterostructures and their exploitation in electronic and optical spin injection experiments.
@article{arxiv.cond-mat/0105499,
title = {Two-Carrier Transport in Epitaxially Grown MnAs},
author = {J. J. Berry and S. J. Potashnik and S. H. Chun and K. C. Ku and P. Schiffer and N. Samarth},
journal= {arXiv preprint arXiv:cond-mat/0105499},
year = {2009}
}
Comments
10 pages + 3 figures; to be published In Phys. Rev. B