We review crystallographic, spectroscopic, magnetic and electrical properties of Mn-doped GaN films showing ferromagnetic behaviour at room temperature. Up to 8.2% of Mn concentration, the films keep transpearency with yellowish colour even with thickness more than 1μm. No second phase is observed by RHEED and XRD measurements. It was found that majority of Mn atoms replace Ga atoms in wurtzite GaN by XAFS study. At room temperature, optical absorption spectra show clear structures implying Mn 3d levels stay in the mid-gap of GaMnN.

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