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An, Kwangjin
Advanced Nanocatalysis Lab (An Lab)
Research Interests
  • Nanoparticle catalytsts, catalytic activity, selectivity, and stability, strong metal-support interactions, CO2 utilization, biomass conversion, Plastic Up-cycling

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Monodispersed MnO nanoparticles with epitaxial Mn3O4 shells

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Title
Monodispersed MnO nanoparticles with epitaxial Mn3O4 shells
Author
Berkowiz, AERodriguez, GFHong, JIAn, KwangjinHyeon, TAgarwal, NSmith, DJFullerton, EE
Keywords
MAGNETIC-PROPERTIES; NANOCRYSTALS
Issue Date
2008-07
Publisher
IOP PUBLISHING LTD
Citation
JOURNAL OF PHYSICS D-APPLIED PHYSICS, v.41, no.13, pp.134007-1 - 134007-5
Abstract
We report the microstructural and magnetic properties of monodispersed nanoparticles ( NPs) of antiferromagnetic MnO ( T-N = 118 K), with epitaxial ferrimagnetic Mn3O4 ( T-C = 43 K) shells. Above T-C, an unusually large magnetization is present, produced by the uncompensated spins ( UCSs) on the surface of the MnO particles. These spins impart a net anisotropy to the MnO particles that is approximately three orders of magnitude larger than the bulk value. As a result, an anomalously high blocking temperature is exhibited by the MnO particles, and finite coercivity and exchange bias are present above T-C. When field cooled below T-C, a strong exchange bias was established in the Mn3O4 shells as a result of high net anisotropy of the MnO particles. A large coercivity was also observed. Models of several aspects of the behaviour of this unusual system emphasized the essential role of the UCSs on the surfaces of the MnO NPs.
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DOI
10.1088/0022-3727/41/13/134007
ISSN
0022-3727
Appears in Collections:
ECHE_Journal Papers
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