High temperature ferromagnetism with a giant magnetic moment in transparent Co-doped SnO2-δ -: art. no. 077205

The occurrence of room temperature ferromagnetism is demonstrated in pulsed laser deposited thin films of Sn1-xCoxO2-delta (x<0.3). Interestingly, films of Sn0.95Co0.05O2-delta grown on R-plane sapphire not only exhibit ferromagnetism with a Curie temperature close to 650 K, but also a giant magnetic moment of 7.5+/-0.5mu(B)/Co, not yet reported in any diluted magnetic semiconductor system. The films are semiconducting and optically highly transparent.