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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...
Polycrystalline perovskite Pr0.7Ca0.3CoO3 and Pr0.5Ca0.5CoO3 have been investigated by electrical resistivity, magnetization, ac susceptibility, and mu SR measurements. The magnetic measurements data indicate that the samples have, at low temperatures, similar properties to the frustrated magnets. The muSR measurements, suggest the presence of magnetic clusters at low temperatures. The electrical...
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