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Detection of spin coupling in iron nanoparticles with small angle neutron scattering

Appl. Phys. Lett. 86, 243102 (2005); doi:10.1063/1.1947906

Published 7 June 2005

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Y. Ijiri and C. V. Kelly
Oberlin College, Department of Physics and Astronomy, Oberlin, Ohio 44074

J. A. Borchers
NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899

J. J. Rhyne
Lujan Neutron Scattering Center, Los Alamos National Laboratory, Los Alamos, New Mexico 87545

D. F. Farrell and S. A. Majetich
Department of Physics, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213
Aggregates of monodisperse iron-based nanoparticles were investigated by small-angle neutron scattering. The field dependence of the scattering intensity showed marked differences for particles depending on size and degree of oxidation. The angular dependence of the intensity indicated magnetic regions within an oxidized sample with spins perpendicular to the applied field, which dominated the scattering at the diffraction peak. The unexpected results are interpreted in terms of an iron core that is exchange coupled to an iron oxide shell. ©2005 American Institute of Physics
History: Received 14 February 2005; accepted 9 May 2005; published 7 June 2005
Permalink: http://link.aip.org/link/?APPLAB/86/243102/1
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KEYWORDS and PACS

Keywords
PACS
  • 75.50.Tt
    Fine-particle magnetic systems; nanocrystalline materials
  • 75.25.+z
    Spin arrangements in magnetically ordered materials including neutron and spin-polarized electron studies, synchrotron-source X-ray scattering, etc
  • 75.30.Et
    Exchange and superexchange interactions in magnetically ordered materials
  • 75.75.+a
    Magnetic properties of nanostructures
  • 81.65.Mq
    Surface oxidation
  • YEAR: 2005

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ISSN:
0003-6951 (print)   1077-3118 (online)
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