High-temperature ferromagnetism in Ni2+-doped ZnO aggregates prepared from colloidal diluted magnetic semiconductor quantum dots -: art. no. 157202

Ferromagnetism with T-c>350 K is observed in the diluted magnetic semiconductor Ni2+:ZnO synthesized from solution. Whereas colloidal Ni2+:ZnO nanocrystals are paramagnetic, their aggregation gives rise to robust ferromagnetism. The appearance of ferromagnetism is attributed to the increase in domain volumes and the generation of lattice defects upon aggregation. The unusual temperature dependence of the magnetization coercivity is discussed in terms of a temperature-dependent exchange interaction involving paramagnetic Ni2+ ions.