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Structural and magnetic properties of MnAs/GaAs ferromagnetic semiconductor nanocomposite material |
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| Authors: | Adam Kwiatkowski Dariusz Wasik Maria Kamińska Jolanta Borysiuk Rafal Bo?ek Janusz Sadowski Andrzej Twardowski |
| Affiliation: | 1. Institute of Experimental Physics, Warsaw University, Ho?a 69, Warsaw, 00-681, Poland 2. Institute of Electronic Materials Technology, Wólczyńska 133, Warsaw, 01-919, Poland 3. Institute of Physics, PAS, Al. Lotników 32/46, Warsaw, 02-668, Poland 4. MAX-Lab, Lund University, Lund, 221 00, Sweden |
| Abstract: | Self-organized (Ga,Mn)As nanoclusters, embedded in GaAs and formed during thermal annealing of Ga1-xMnxAs layer at 500 °C or 600 °C, were studied using Transmission Electron Microscopy (TEM) and Magnetic Force Microscopy (MFM). We found that 10–20 nm large NiAs-type hexagonal MnAs nanocrystals gave magnetic contrast in MFM images, whereas smaller zinc-blende nanoinclusions were not visible by means of this technique. Theoretical simulations showed that MFM contrasts reflect interaction between magnetic tip and many randomly distributed MnAs nanocrystals. |
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