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심재호(Jae Ho Sim),김효진(Hyojin Kim),김도진(Dojin Kim),임영언(Young Eon Ihm),윤순길(Soon Kil Yoon),김현중(Hyun Jung Kim),주웅길(Woong Kil Choo) 한국자기학회 2005 韓國磁氣學會誌 Vol.15 No.3
We have investigated the effects of Al codoping on the structural, electrical transport, and magnetic properties of oxide diluted magnetic semiconductor Zn_(1-x)Cr_xO thin films prepared by reactive sputtering. Nondoped Zn_(0.99)Cr_(0.01)O thin films show semiconducting transport behavior and weak ferromagnetic characteristic. The Al doping increases the carrier concentration and results in an decrease of resistivity and metal-insulator transition behavior. With increasing carrier concentration, the magnetic properties drastically change, exhibiting a remarkable increase of the saturation magnetization. These results show carrier-enhanced ferromagnetic order in Cr-doped ZnO.