Surface anisotropy and magnetic freezing of MnO nanoparticles

M. A. Morales, R. Skomski, S. Fritz, G. Shelburne, J. E. Shield, Ming Yin, Stephen O'Brien, D. L. Leslie-Pelecky

Research output: Contribution to journalArticlepeer-review

54 Scopus citations

Abstract

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.

Original languageEnglish (US)
Article number134423
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume75
Issue number13
DOIs
StatePublished - Apr 26 2007
Externally publishedYes

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