High-temperature ferromagnetism in epitaxial (In,Mn)Sb films

We report ferromagnetism in single phase, epitaxial In1-x Mnx Sb alloy films, with x≤0.035, grown by metalorganic vapor phase epitaxy. The alloy films exhibit well-defined magnetization versus magnetic field hysteresis loops from 4-298 K. High-field magnetotransport measurements indicated that the Hall resistivity has a nonlinear dependence on magnetic field. Ferromagnetism is supported by observation of an anomalous Hall effect and clear hysteresis in the anomalous Hall resistivity versus magnetic field measurements. Zero field cooled and field cooled magnetization measurements show reversibility indicating absence of second phase precipitates. The temperature dependence of the magnetization is described by a modified Brillouin function with a TC of 590 K. The observed magnetic and magnetotransport properties are attributed to carrier mediated ferromagnetism involving Mn and its complexes that form shallow or resonant electronic states through correlated substitution in the semiconductor host.