Room-temperature ferromagnetic films with ranging from 0.0005 to 0.04 and antiferromagnetic CrN films have been grown by plasma-assisted molecular-beam epitaxy. Electron and x-ray-diffraction techniques could find no evidence for precipitates or phase segregation within the films. Ferromagnetism was observed in the layers over a wide range of Cr concentrations, with the magnitude of the ferromagnetism found to correlate with the background carrier concentration. Higher -type carrier concentrations were found to lead enhanced ferromagnetism, with maximum saturation and remnant moments of 7 and , respectively. The addition of Cr to the InN matrix led to reduced photoluminescence intensity and a shift of the peak to higher energy. These observations along with a band-gap-like optical transmission feature at 0.7 eV suggest that CrN has an indirect gap of approximately 0.7 eV and a direct -valley gap greater than 1.2 eV.
Magnetic and optical properties of the InCrN system
P. A. Anderson, R. J. Kinsey, S. M. Durbin, A. Markwitz, V. J. Kennedy, A. Asadov, W. Gao, R. J. Reeves; Magnetic and optical properties of the InCrN system. J. Appl. Phys. 15 August 2005; 98 (4): 043903. https://doi.org/10.1063/1.1993753
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