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We report on the room temperature ferromagnetism in Co-doped wurtzite ZnS nanocrystals with size of about 5 nm, which gradually becomes weak as the increase of doping concentration. The coercivities for all samples maintain at about 200 Oe, and the saturation magnetic moment per Co ion decreases sharply for high doping samples. Besides ferromagnetism and paramagnetism, the temperature dependence of...
Magnetoresistance of cobalt-doped zinc oxide and cuprous oxide ferromagnetic nanoparticles with different cobalt concentrations are studied. Zeeman splitting effect is found to play a key role in the electrical transport of our cobalt-doped oxide ferromagnetic nanoparticles. We emphasize that the existence of large Zeeman splitting effect can be used in spintronics devices, because a very large and...
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