MnAs Nanocrystals Embedded in GaAs

We report on cross-sectional transmission electron microscopy and magnetic force microscopy studies performed on self-organized MnAs nanoclusters embedded in GaAs.It was found that 10 ÷ 20 nm large MnAs ferromagnetic nanocrystals were formed during rapid thermal annealing of Ga1-xMnxAs layers at 600 • C, leading to magnetic contrasts in magnetic force microscopy images.