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In-field Mossbauer study of disordered surface spins in core/shell ferrite nanoparticles

J. Appl. Phys. 106, 093901 (2009); doi:10.1063/1.3245326

Published 2 November 2009

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E. C. Sousa,1 H. R. Rechenberg,2 J. Depeyrot,1 J. A. Gomes,1 R. Aquino,3 F. A. Tourinho,4 V. Dupuis,5 and R. Perzynski5
1Complex Fluid Group, Instituto de Fisica, Universidade de Brasilia, Caixa Postal 04455, 70919-970 Brasilia (DF), Brazil
2Instituto de Fisica, Universidade de Sao Paulo, Caixa Postal 66318, 05315-970 Sao Paulo, Brazil
3Complex Fluid Group, Faculdade UnB Planaltina, Universidade de Brasilia, Brazil
4Complex Fluid Group, Instituto de Quimica, Universidade de Brasilia, Caixa Postal 04478, 70919-970 Brasilia (DF), Brazil
5PECSA, Universite Pierre et Marie Curie, 4 Place Jussieu, 75005 Paris, France
Magnetization and Mossbauer spectroscopy measurements are performed at low temperature under high field, on nanoparticles with a nickel ferrite core and a maghemite shell. These nanoparticles present finite size and surface effects, together with exchange anisotropy. High field magnetization brings the evidences of a monodomain ordered core and surface spins freezing in disorder at low temperature. Mossbauer spectra at 4.2 K present an extra contribution from the disordered surface which is field dependent. Field and size dependences of this latter show a progressive spin alignment along the ferrite core which is size dependent. The weak surface pinning condition of the nanoparticles confirms that the spin disorder is localized in the external shell. The underfield decrease in the mean canting angle in the superficial shell is then directly related to the unidirectional exchange anisotropy through the interface between the ordered core and the disordered shell. The obtained anisotropy field HEa scales as the inverse of the nanoparticle diameter, validating its interfacial origin. The associated anisotropy constant KEa equals 2.5×10−4  J/m2. ©2009 American Institute of Physics
History: Received 24 April 2009; accepted 12 September 2009; published 2 November 2009
Permalink: http://link.aip.org/link/?JAPIAU/106/093901/1
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KEYWORDS and PACS

Keywords
PACS
  • 76.80.+y
    Mössbauer effect; other γ-ray spectroscopy in condensed matter
  • 75.60.Ej
    Magnetization curves, hysteresis, Barkhausen and related effects
  • 75.30.Gw
    Magnetic anisotropy
  • 75.50.Tt
    Fine-particle magnetic systems; nanocrystalline materials
  • YEAR: 2009

PUBLICATION DATA

ISSN:
0021-8979 (print)   1089-7550 (online)
Publisher:
AIP is a member of CrossRef AIP

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