Role of carrier and spin in tuning ferromagnetism in Mn and Cr-doped In2O3 thin films

Feng-Xian Jiang; Xiao-Hong Xu; Jun Zhang; Xiao-Chen Fan; Hai-Shun Wu; Gehring, G. A.
February 2010
Applied Physics Letters;2/1/2010, Vol. 96 Issue 5, p052503
Academic Journal
Mn and Cr-doped In2O3 films with Sn codoping were deposited on sapphire substrate by pulsed laser deposition. The ferromagnetism of Mn-doped In2O3 films shows reversible behavior, which can be switched between “on” and “off” states by controlling the carrier density via varying Sn concentration. The enhanced ferromagnetism in Cr-doped In2O3 films is observed due to the significant increase in the carrier density with Sn doping, and the saturation magnetization can reach 2.10 μB/Cr. Most importantly, both of the experiment results reveal that the carrier density and the net spin are two crucial factors for producing and tuning ferromagnetism.


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