Annealing-dependence of Exchange Bias in MnO/Ga1-xMnxAs Heterostructures

Details Annealing-dependence of Exchange Bias in MnO/Ga1-xMnxAs Heterostructures Annealing-dependence of Exchange Bias in MnO/Ga1-xMnxAs Heterostructures

2004-09-05

arxiv.org/abs/cond-mat/0409108v1

Physics

Condensed Matter

Materials Science

To be published in Journal of Superconductivity, Proceedings of 3rd International Conference on Physics & Applications of Spin

Scientific paper

10.1007/s10948-005-0019-9

We discuss the annealing-dependence of exchange bias in Ga1-xMnxAs epilayers that are overgrown with Mn. Although pure Mn is a known antiferromagnet, we find that the as-grown Mn overlayer does not produce any exchange coupling with Ga1-xMnxAs. Rather, our studies indicate that annealing in air is essential for creating the standard signatures of an exchange bias (a clear shift in the magnetization hysteresis loop and an increased coercive field). We use x-ray photoelectron spectroscopy to characterize the compositional depth profile of both as-grown and rapid thermal annealed samples. These studies demonstrate that the cleanest exchange bias arises when the Mn overlayer is completely converted into MnO.

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