Abstract
In this paper, we have investigated Mn-doped SnO2 powder samples prepared by solid-state reaction method. X-ray diffraction showed a single phase polycrystalline rutile structure. The atomic content of Mn ranged from ∼0.8 to 5at%. Room temperature M–H loops showed a ferromagnetic behavior for all samples. The ferromagnetic Sn0.987Mn0.013O2 showed a coercivity Hc=545Oe, which is among the highest reported for dilute magnetic semiconductors. The magnetic moment per Mn atom was estimated to be about 2.54μB of the Sn0.9921Mn0.0079O2 sample. The average magnetic moment per Mn atom sharply decreases with increasing Mn content, while the effective fraction of the Mn ions contributing to the magnetization decreases. The magnetic properties of the Sn1−xMnxO2 are discussed based on the competition between the antiferromagnetic superexchange coupling and the F-center exchange coupling mechanism, in which both oxygen vacancies and magnetic ions are involved.
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