Abstract
We have investigated the effect of postgrowth annealing on the surface morphology and magnetic properties of monocrystalline MnAs thin films epitaxially grown on GaAs(001) substrates by molecular beam epitaxy. After the growth of MnAs, the postgrowth annealing was carried out in the temperature range between 330 and 400 °C, with keeping the MnAs surface exposed to the As flux. The surface morphology and crystallinity of MnAs thin films were drastically improved by optimizing the annealing temperature. The magnetic properties, such as saturation magnetization, coercivity, and the magnetoresistance characteristics of the MnAs films were sensitive to their crystallinity, which was determined by the annealing temperature.
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