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Surface anisotropy and magnetic freezing of MnO nanoparticles

2007
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Article Description

Nanoparticles of bulk antiferromagnets often exhibit ferromagnetic behavior due to uncompensated surface spins. The peak temperature in the zero-field-cooled magnetization of MnO—in contrast to other antiferromagnetic nanoparticles—has anomalous behavior, shifting to higher temperatures with decreasing nanoparticle size. We attribute this behavior to surface anisotropy enhanced by the specific occupancy of 3d levels in Mn, which produces a high-spin–low-spin transition not present in NiO nanoparticles.

Bibliographic Details

Marco Morales Torres; Ralph Skomski; Shannon Fritz; G. Shelburne; Jeffrey E. Shield; Ming Yin; Stephen O'Brien; Diandra Leslie-Pelecky

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