The reference details

H. X. Liu, Stephen Y. Wu, R. K. Singh, Lin Gu, David J. Smith, N. Newman, N. R. Dilley, L. Montes, and M. B. Simmonds, "Observation of ferromagnetism above 900 K in Cr–GaN and Cr–AlN", Appl. Phys. Lett. 85, 4076 (2004): on-line

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