Abstract
We present a study of the magnetic and structural effects generated by ball milling on different compounds recently reported as room-temperature magnetic semiconductors: a stoichiometric mixture of ZnO and MnO 2 and single-phase samples of Zn 0.96M 0.04O (M Co and Mn). In general, a dramatic reduction of the average crystal size is observed. None of our samples present a ferromagnetic state induced by ball milling, in contradiction with previous results.
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