Core-Shell Magnetic Morphology of Structurally Uniform Magnetite Nanoparticles

K. L. Krycka, R. A. Booth, C. R. Hogg, Y. Ijiri, J. A. Borchers, W. C. Chen, S. M. Watson, M. Laver, T. R. Gentile, L. R. Dedon, S. Harris, J. J. Rhyne, and S. A. Majetich
Phys. Rev. Lett. 104, 207203 – Published 19 May 2010
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Abstract

A new development in small-angle neutron scattering with polarization analysis allows us to directly extract the average spatial distributions of magnetic moments and their correlations with three-dimensional directional sensitivity in any magnetic field. Applied to a collection of spherical magnetite nanoparticles 9.0 nm in diameter, this enhanced method reveals uniformly canted, magnetically active shells in a nominally saturating field of 1.2 T. The shell thickness depends on temperature, and it disappears altogether when the external field is removed, confirming that these canted nanoparticle shells are magnetic, rather than structural, in origin.

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  • Received 25 February 2010

DOI:https://doi.org/10.1103/PhysRevLett.104.207203

©2010 American Physical Society

Authors & Affiliations

K. L. Krycka1, R. A. Booth2, C. R. Hogg2, Y. Ijiri3, J. A. Borchers1, W. C. Chen1,4, S. M. Watson1, M. Laver5, T. R. Gentile1, L. R. Dedon3, S. Harris3, J. J. Rhyne6, and S. A. Majetich2

  • 1NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA
  • 2Department of Physics, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA
  • 3Department of Physics and Astronomy, Oberlin College, Oberlin, Ohio 44074, USA
  • 4Department of Materials Science and Engineering, University of Maryland, College Park, Maryland 20742-2115, USA
  • 5Paul Scherrer Institute, Villigen, Switzerland
  • 6Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA

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Issue

Vol. 104, Iss. 20 — 21 May 2010

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