Critical dimension for magnetic exchange-spring coupled core/shell CoFe2O4=CoFe2 nanoparticles

Araújo, José Humberto de; Soares, João Maria; Galdino, V.B.; Conceição, Ozivam Lopes de Aquino; Torres, Marco Antonio Morales; Machado, Fernando L. A.

Critical dimension for magnetic exchange-spring coupled core/shell CoFe2O4=CoFe2 nanoparticles

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dc.contributor.author	Araújo, José Humberto de
dc.contributor.author	Soares, João Maria
dc.contributor.author	Galdino, V.B.
dc.contributor.author	Conceição, Ozivam Lopes de Aquino
dc.contributor.author	Torres, Marco Antonio Morales
dc.contributor.author	Machado, Fernando L. A.
dc.date.accessioned	2020-06-25T18:24:35Z
dc.date.available	2020-06-25T18:24:35Z
dc.date.issued	2013-01
dc.description.resumo	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	pt_BR
dc.identifier.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: https://www.sciencedirect.com/science/article/pii/S0304885312007287?via%3Dihub Acesso em: 23 jun 2020. https://doi.org/10.1016/j.jmmm.2012.08.040.	pt_BR
dc.identifier.doi	10.1016/j.jmmm.2012.08.040
dc.identifier.issn	0304-8853
dc.identifier.uri	https://repositorio.ufrn.br/jspui/handle/123456789/29364
dc.language	en	pt_BR
dc.publisher	Elsevier	pt_BR
dc.rights	Attribution 3.0 Brazil	*
dc.rights.uri	http://creativecommons.org/licenses/by/3.0/br/	*
dc.subject	Cobalt ferrite	pt_BR
dc.subject	Iron–cobalt alloy	pt_BR
dc.subject	Core–shell	pt_BR
dc.subject	Nanoparticles	pt_BR
dc.subject	Exchange-spring	pt_BR
dc.title	Critical dimension for magnetic exchange-spring coupled core/shell CoFe2O4=CoFe2 nanoparticles	pt_BR
dc.type	article	pt_BR