Solid phase epitaxy of ferromagnetic MnAs dots on GaMnAs layers

Details Solid phase epitaxy of ferromagnetic MnAs dots on GaMnAs layers Solid phase epitaxy of ferromagnetic MnAs dots on GaMnAs layers

2005-04-04

arxiv.org/abs/cond-mat/0504074v2

Physics

Condensed Matter

Materials Science

12 pages, 4 figures

Scientific paper

Formation of MnAs quantum dots in a regular ring-like distribution has been found on MBE-grown (GaMn)As surfaces after low-temperature annealing under As capping. The Mn was supplied by out-diffusing Mn interstitials from (GaMn)As. With 5 at% substitutional Mn the quantum dots appeared for (GaMn)As layers thicker than 500 A. For thinner layers the Mn-rich surfaces, presumably monolayer thick MnAs, are smooth and well-ordered (1x2), and are well suited for continued epitaxial growth.

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