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Title: Critical dimension for magnetic exchange-spring coupled core/shell CoFe2O4=CoFe2 nanoparticles
Authors: Araújo, José Humberto de
Soares, João Maria
Galdino, V.B.
Conceição, Ozivam Lopes de Aquino
Torres, Marco Antonio Morales
Machado, Fernando L. A.
Keywords: Cobalt ferrite;Iron–cobalt alloy;Core–shell;Nanoparticles;Exchange-spring
Issue Date: Jan-2013
Publisher: Elsevier
Citation: SOARES, J.M.; GALDINO, V.B.; CONCEIÇÃO, O.L.A.; MORALES, M.A.; ARAÚJO, J.H. de; MACHADO, F.L.A. Critical dimension for magnetic exchange-spring coupled core/shell nanoparticles. Journal of Magnetism and Magnetic Materials, v. 326, p. 81-84, 2013. Disponível em: Acesso em: 23 jun 2020.
Portuguese Abstract: Core/shell nanoparticles of CoFe2O4=CoFe2 were prepared by reducing nanoparticles of CoFe2O4 under hydrogen atmospheres. The structure, morphology and room temperature magnetization of the core/ shell nanoparticles were analyzed by X-ray diffraction, transmission electron microscopy and magnetometry, respectively. The sample preparation procedure allowed the diameter of the CoFe2O4 core to be varied from 67.7 to 2.8 nm. From the magnetic data it was found that the core couples to the shell through the exchange-spring mechanism while the critical thickness of the soft phase (shell) was estimated using a current theoretical model to be 8.0 nm. This value is very close to the one (7.8 nm) obtained for nanoparticles with same composition but obtained using different synthesis route and having an average particle size (32 nm) less than half of the value estimated (73 nm) for the samples investigated in the present work
ISSN: 0304-8853
Appears in Collections:CCET - DFTE - Artigos publicados em periódicos

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