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In order to elucidate the nature of ferromagnetic signatures observed in(Zn,Co)O we have examined experimentally and theoretically magnetic propertiesand spin-dependent quantum localization effects that control low-temperaturemagnetoresistance. Our findings, together with a through structuralcharacterization, substantiate the model assigning spontaneous magnetization of(Zn,Co)O to uncompensated spins at the surface of antiferromagnetic nanocrystalof Co-rich wurtzite (Zn,Co)O. The model explains a large anisotropy observed inboth magnetization and magnetoresistance in terms of spin hamiltonian of Coions in the crystal field of the wurtzite lattice.

Origin of ferromagnetism in (Zn,Co)O from magnetization and spin-dependent magnetoresistance