Optical and magnetic properties of laser-deposited Co-doped ZnO thin films |
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| Authors: | Jae Hyun Kim Dojin Kim Woong Kil Choo |
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| Affiliation: | a Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, Daejeon 305-701, South Korea
b Department of Materials Science and Engineering, Chungnam National University, Daeduk Science Town, Daejeon 305-764, South Korea |
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| Abstract: | We report the optical and magnetic properties of laser-deposited Zn1−xCoxO (x=0.06-0.3) thin films with no intentional electrical carrier doping. The analysis of the high-temperature magnetization data provides an unambiguous evidence that antiferromagnetic superexchange interaction is the dominant mechanism of the exchange coupling between Co ions in Zn1−xCoxO alloy, yielding the value of the effective exchange integral J1/kB to be about −27 K. The low-temperature magnetization data reveals a spin glass transition in Zn1−xCoxO alloy for the Co content x>0.15, giving the value of the spin freezing temperature Tf to be ∼8 and ∼12 K for x=0.2 and 0.25, respectively. Optical spectra analysis shows a linear increase of the band gap Eg with the increase of the Co content following Eg=3.231+1.144x eV. |
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| Keywords: | 75.50.Pp 75.70.Ak 78.20.&minus e |
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