Mn(2)O(3)/Mn(3)O(4) nanoclusters were prepared by air oxidation of Mn(3)O(4) nanoparticles. The nanoparticles located at the surface of the Mn(2)O(3)/Mn(3)O(4) nanoclusters are oxidized to Mn(3)O(4) to form the special structure of the Mn(2)O(3)/Mn(3)O(4) nanoclusters. An exchange bias was observed in the Mn(2)O(3)/Mn(3)O(4) nanoclusters, which was induced by exchange coupling between ferromagnetic Mn(3)O(4) and antiferromagnetic Mn(3)O(4) phases. (C) 2009 American Institute of Physics. [DOI: 10.1063/1.3055349]
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