Magnetic and transport properties were investigated in Zn0.94Mn0.03Co0.03O thin films prepared by dual radio frequency magnetron sputtering technique. A negative magnetoresistance (MR=[ρ(H)−ρ(0)]∕ρ(0)) of −95% at 2K and a positive MR of 48% at 10K were established in the films. The anomalous magnetic and magnetic-related transport properties in transition-metal-doped ZnO films are discussed in terms of magnetic polarons.
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Wang et al. (2006) studied this question.
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