Ferromagnetic nanoclusters formed by Mn implantation in GaAs

Couto, O. D. D.; Brasil, M. J. S. P.; Iikawa, F.; Giles, C.; Adriano, C.; Bortoleto, J. R. R.; Pudenzi, M. A. A.; Gutierrez, H. R.; Danilov, I.
February 2005
Applied Physics Letters;2/14/2005, Vol. 86 Issue 7, p071906
Academic Journal
Ferromagnetic clusters were incorporated into GaAs samples by Mn implantation and subsequent annealing. The composition and structural properties of the Mn-based nanoclusters formed at the surface and buried into the GaAs sample were analyzed by x-ray and microscopic techniques. Our measurements indicate the presence of buried MnAs nanoclusters with a structural phase transition around 40 °C, in accord with the first-order magneto-structural phase transition of bulk MnAs. We discuss the structural behavior of these nanoclusters during their formation and phase transition, which is an important point for technological applications.


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