| Autor: |
Anderson, P. A., Kinsey, R. J., Durbin, S. M., Markwitz, A., Kennedy, V. J., Asadov, A., Gao, W., Reeves, R. J. |
| Předmět: |
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| Zdroj: |
Journal of Applied Physics; 8/15/2005, Vol. 98 Issue 4, p043903, 5p, 2 Black and White Photographs, 7 Graphs |
| Abstrakt: |
Room-temperature ferromagnetic In1-xCrxN films with x 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 In1-xCrxN layers over a wide range of Cr concentrations, with the magnitude of the ferromagnetism found to correlate with the background carrier concentration. Higher n-type carrier concentrations were found to lead enhanced ferromagnetism, with maximum saturation and remnant moments of 7 and 0.7 emu/cm3, 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 Γ-valley gap greater than 1.2 eV. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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