Abstract
Ferromagnetic properties of In 1− x Mn x As thin films were investigated. Room temperature ferromagnetic order was observed in nominally single-phase films with x=0.01–0.10. Magnetization measurements indicated that these In 1− x Mn x As samples had a Curie temperature of 333 K. The Curie temperature was independent of Mn concentration. The temperature dependent magnetization along with the magnitude of the saturation magnetization and microstructural data indicate that the source of the high-temperature ferromagnetism in single-phase films is not attributable to MnAs nanoprecipitates. The high transition temperature is attributed to the presence of near neighbor Mn pairs.
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