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dc.contributor.author
Torres, T.E.  
dc.contributor.author
Lima, Enio Junior  
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Mayoral, A.  
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Ibarra, A.  
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Marquina, C.  
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Ibarra, M.R.  
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Goya, Gerardo Fabian  
dc.date.available
2018-08-27T14:06:53Z  
dc.date.issued
2015-11-12  
dc.identifier.citation
Torres, T.E.; Lima, Enio Junior; Mayoral, A.; Ibarra, A.; Marquina, C.; et al.; Validity of the Néel-Arrhenius model for highly anisotropic CoxFe3−xO4 nanoparticles; American Institute of Physics; Journal of Applied Physics; 118; 18; 12-11-2015; 183902/1-183902/11  
dc.identifier.issn
0021-8979  
dc.identifier.uri
http://hdl.handle.net/11336/57149  
dc.description.abstract
We report a systematic study on the structural and magnetic properties of CoxFe3−xO4 magnetic nanoparticles with sizes between 5 and 25 nm, prepared by thermal decomposition of Fe(acac)3 and Co(acac)2. The large magneto-crystalline anisotropy of the synthesized particles resulted in high blocking temperatures (42 K < TB < 345 K for 5 < d < 13 nm) and large coercive fields (HC ≈ 1600 kA/m for T = 5 K). The smallest particles (⟨d⟩=5 nm) revealed the existence of a magnetically hard, spin-disordered surface. The thermal dependence of static and dynamic magnetic properties of the whole series of samples could be explained within the Neel?Arrhenius relaxation framework by including the thermal dependence of the magnetocrystalline anisotropy constant K1(T), without the need of ad-hoc corrections. This approach, using the empirical Brükhatov-Kirensky relation, provided K1(0) values very similar to the bulk material from either static or dynamic magnetic measurements, as well as realistic values for the response times (τ0 ≈ 10−10s). Deviations from the bulk anisotropy values found for the smallest particles could be qualitatively explained based on Zener´s relation between K1(T) and M(T).  
dc.format
application/pdf  
dc.language.iso
eng  
dc.publisher
American Institute of Physics  
dc.rights
info:eu-repo/semantics/openAccess  
dc.rights.uri
https://creativecommons.org/licenses/by/2.5/ar/  
dc.subject
Magnetic Anisotropy  
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Nanoparticles  
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Ferrites  
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Astronomía  
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Ciencias Físicas  
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CIENCIAS NATURALES Y EXACTAS  
dc.title
Validity of the Néel-Arrhenius model for highly anisotropic CoxFe3−xO4 nanoparticles  
dc.type
info:eu-repo/semantics/article  
dc.type
info:ar-repo/semantics/artículo  
dc.type
info:eu-repo/semantics/publishedVersion  
dc.date.updated
2018-08-27T13:12:44Z  
dc.journal.volume
118  
dc.journal.number
18  
dc.journal.pagination
183902/1-183902/11  
dc.journal.pais
Estados Unidos  
dc.journal.ciudad
New York  
dc.description.fil
Fil: Torres, T.E.. Universidad de Zaragoza. Instituto de Nanociencia de Aragón; España  
dc.description.fil
Fil: Lima, Enio Junior. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte; Argentina. Comisión Nacional de Energía Atómica. Gerencia del Área de Investigación y Aplicaciones No Nucleares. Gerencia de Física. Laboratorio de Resonancias Magnéticas; Argentina  
dc.description.fil
Fil: Mayoral, A.. Universidad de Zaragoza. Instituto de Nanociencia de Aragón; España  
dc.description.fil
Fil: Ibarra, A.. Universidad de Zaragoza. Instituto de Nanociencia de Aragón; España  
dc.description.fil
Fil: Marquina, C.. Consejo Superior de Investigaciones Científicas; España. Universidad de Zaragoza; España  
dc.description.fil
Fil: Ibarra, M.R.. Universidad de Zaragoza. Instituto de Nanociencia de Aragón; España  
dc.description.fil
Fil: Goya, Gerardo Fabian. Universidad de Zaragoza. Instituto de Nanociencia de Aragón; España  
dc.journal.title
Journal of Applied Physics  
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://aip.scitation.org/doi/10.1063/1.4935146  
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info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1063/1.4935146