High Curie temperatures in ferromagnetic Cr-doped AlN thin films

Kumar, D.; Antifakos, J.; Blamire, M. G.; Barber, Z. H.
June 2004
Applied Physics Letters;6/14/2004, Vol. 84 Issue 24, p5004
Academic Journal
Al1-xCrxN thin films with 0.02≤x≤0.1 were deposited by reactive co-sputtering onto c-plane (001) sapphire. Room-temperature ferromagnetism with a coercive field of 85 Oe was observed in samples with chromium contents as low as x=0.027 (2.7%). With increasing Cr content the mean magnetic moment is strongly suppressed, with a maximum saturation moment of 0.62 and 0.71 μB per Cr atom at 300 and 50 K, respectively. We show that the Curie temperature of Al1-xCrxN for x=0.027 is greater than 900 K. © 2004 American Institute of Physics.


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