Journal
PHYSICAL REVIEW B
Volume 68, Issue 22, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.68.224436
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We have investigated electronic structures and magnetic properties of ZnO-based potential diluted magnetic semiconductors codoped with transition metals: Zn1-x(FeCo)(x)O and Zn1-x(FeCu)(x)O. We have found that the origin of the observed ferromagnetism in Zn1-x(FeCo)(x)O would be different from that in Zn1-x(FeCu)(x)O. Zn1-x(FeCo)(x)O does not have a tendency to form the Fe-O-Co ferromagnetic cluster, and so the double-exchange mechanism will not be effective. In contrast, Zn1-x(FeCu)(x)O has a tendency to form the Fe-O-Cu ferromagnetic cluster with the charge transfer between Fe and Cu, which would lead to the ferromagnetism via a type of the double-exchange mechanism. The ferromagnetic and nearly half-metallic ground state is obtained for Zn1-x(FeCu)(x)O.
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