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Anomalous Magnetic Properties of MnO Nanoclusters

2002; American Chemical Society; Volume: 124; Issue: 41 Linguagem: Inglês

10.1021/ja027558m

1943-2984

Gang H. Lee, Seung Hun Huh, Jin Wook Jeong, Byeong Ju Choi, Seung H. Kim, Hyeong-C. Ri,

High-pressure geophysics and materials

In this communication, we experimentally report, for the first time, that the MnO nanoclusters with cluster diameters of 5-10 nm show a ferromagnetic behavior with a phase transition from ferromagnetic to paramagnetic phases at 27 K even though their bulk phase is antiferromagnetic. We observed large coercivities up to 9500 Oe and a large remanence of 1.72 emu/g at 2 K, which are typically observed values for ferromagnetic materials. Although it is not clear, this abnormal ferromagnetic behavior of MnO nanoclusters may arise from cluster size effects.