Abstract
We report on the dependence of the magnetic and transport properties of ferromagnetic semiconductor superlattices on the temperature, ${T}_{G}$, of growth by molecular-beam-epitaxy, at low ${T}_{G}$ from $260\phantom{\rule{0.2em}{0ex}}\ifmmode^\circ\else\textdegree\fi{}\mathrm{C}\phantom{\rule{0.5em}{0ex}}\text{to}\phantom{\rule{0.5em}{0ex}}300\phantom{\rule{0.2em}{0ex}}\ifmmode^\circ\else\textdegree\fi{}\mathrm{C}$. The Curie temperature, ${T}_{C}$, of these $\mathrm{Mn}\mathrm{As}∕\mathrm{Ga}\mathrm{As}$ digital alloy structures shows nonmonotonic variation with ${T}_{G}$ that accompanies a steady increase in conductivity. We observe qualitative changes in the temperature-dependence of the anomalous Hall effect, with a striking sign reversal at temperatures comparable to ${T}_{C}$ in superlattices grown at higher ${T}_{G}$.
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