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Evidence for room temperature ferromagnetism in the In1-xCrxN system
R.J. Kinsey,P.A. Anderson,Z. Liu,S. Ringer,S.M. Durbin 한국물리학회 2006 Current Applied Physics Vol.6 No.3
Despite considerable research on the nitride based dilute magnetic semiconductors (DMS) there is still considerable uncertainty as tothe origin of the room temperature ferromagnetism, with clusters and precipitates suggested. We have studied chromium doped indiumnitride (In1. xCrxN) withx varying from 0.005 to 0.04 and have observed room temperature ferromagnetic behaviour in all of our lmswithx within the growing lm suggests that it is on interstitial sites. We also do not see a signicant paramagnetic component in temperaturedependent magnetisation measurements, which also suggests that any superparamagnetic behaviour due to chromium clusters is not asignicant part of the magnetic behaviour. The magnitude of the ferromagnetic signal scales with the electron concentration in the lm,rather than the chromium concentration, which may suggest that In1. xCrxN shows the electron based equivalent of the hole mediatedferromagnetism observed in Ga1. xMn xAs.