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The influence of annealing parameters---temperature (Tₐ) and time (tₐ)---on the magnetic properties of As-capped (Ga,Mn)As epitaxial thin films has been investigated. The dependence of the transition temperature (TC) on tₐ marks out two regions. The TC peak behavior, characteristic of the first region, is more pronounced for thick samples, while for the second (``saturated'') region the effect of tₐ is more pronounced for thin samples. A right choice of the passivation medium, growth conditions along with optimal annealing parameters routinely yield TC-values of ~1500.3em0exK and above, regardless of the thickness of the epilayers.
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Stanciu et al. (2005) studied this question.
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