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Magnetization reversal in europium sulfide nanocrystals

Appl. Phys. Lett. 89, 222501 (2006); doi:10.1063/1.2396915

Published 27 November 2006

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Marcela L. Redígolo
Department of Physics and Astronomy, Vanderbilt University, Nashville, Tennessee 37235 and Vanderbilt Institute for Nanoscale Science and Engineering, Vanderbilt University, Nashville, Tennessee 37235

Dmitry S. Koktysh
Department of Chemistry, Vanderbilt University, Nashville, Tennessee 37235 and Vanderbilt Institute for Nanoscale Science and Engineering, Vanderbilt University, Nashville, Tennessee 37235

Sandra J. Rosenthal
Department of Chemistry, Vanderbilt University, Nashville, Tennessee 37235; Department of Physics and Astronomy, Vanderbilt University, Nashville, Tennessee 37235 and Vanderbilt Institute for Nanoscale Science and Engineering, Vanderbilt University, Nashville, Tennessee 37235

James H. Dickerson
Department of Physics and Astronomy, Vanderbilt University, Nashville, Tennessee 37235 and Vanderbilt Institute for Nanoscale Science and Engineering, Vanderbilt University, Nashville, Tennessee 37235

Zheng Gai
Center for Nanophase Materials Science Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831 and Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831

Lan Gao
Center for Nanophase Materials Science Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831

Jian Shen
Center for Nanophase Materials Science Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831 and Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831
The authors report the observation of the reversal in the magnetization hysteresis curve of europium sulfide nanocrystals. This phenomenon was investigated through the temperature-dependent magnetization of two classes of nanomaterials, nanocrystalline (2.0  nm<=dNCs<=100  nm) and quantum confined (dNCs<=2.0  nm), where dNCs is the diameter of the nanomaterial. The effect of the size of the nanomaterial on the magnetization is attributed to the competition between the magnetic properties of strained surface atoms and unstrained core atoms. Superconducting quantum interference device probed the magnetic response. Electron microscopy and X-ray diffraction spectroscopy revealed the crystallinity and monodispersivity of the nanomaterials. ©2006 American Institute of Physics
History: Received 21 August 2006; accepted 9 October 2006; published 27 November 2006
Permalink: http://link.aip.org/link/?APPLAB/89/222501/1
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KEYWORDS and PACS

Keywords
PACS
  • 75.60.Jk
    Magnetization reversal mechanisms
  • 75.60.Ej
    Magnetization curves, hysteresis, Barkhausen and related effects
  • 75.50.Tt
    Fine-particle magnetic systems; nanocrystalline materials
  • 75.50.Dd
    Nonmetallic ferromagnetic materials
  • 61.46.Hk
    Nanocrystals
  • YEAR: 2006

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