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

doi:10.1103/PhysRevB.75.134423

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

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60 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 language	English (US)
Article number	134423
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	75
Issue number	13
DOIs	https://doi.org/10.1103/PhysRevB.75.134423
State	Published - Apr 26 2007
Externally published	Yes

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title = "Surface anisotropy and magnetic freezing of MnO nanoparticles",

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.",

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AU - Morales, M. A.

AU - Skomski, R.

AU - Fritz, S.

AU - Shelburne, G.

AU - Shield, J. E.

AU - Yin, Ming

AU - O'Brien, Stephen

AU - Leslie-Pelecky, D. L.

PY - 2007/4/26

Y1 - 2007/4/26

N2 - 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.

AB - 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.

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Surface anisotropy and magnetic freezing of MnO nanoparticles

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