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dc.contributor.author
de Biasi, Emilio
dc.contributor.author
Lima, Enio Junior
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Vargas, Jose Marcelo
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Zysler, Roberto Daniel
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Arbiol, Jordi
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Ibarra, Alfonso
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Goya, Gerardo Fabian
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Ibarra, Ricardo M.
dc.date.available
2018-08-13T22:52:30Z
dc.date.issued
2015-10-05
dc.identifier.citation
de Biasi, Emilio; Lima, Enio Junior; Vargas, Jose Marcelo; Zysler, Roberto Daniel; Arbiol, Jordi; et al.; Exchange bias in ferrite hollow nanoparticles originated by complex internal magnetic structure; IOP Publishing; Materials Research Express; 2; 10; 5-10-2015; 105001/1-105001/11
dc.identifier.issn
2053-1591
dc.identifier.uri
http://hdl.handle.net/11336/55302
dc.description.abstract
Iron-oxide hollow nanospheres (HNS) may present unusual magnetic behavior as a consequence of their unique morphology. Here, we report the unusual magnetic behavior ofHNS that are 9 nmin diameter. The magnetic properties ofHNSoriginate in their complex magnetic structure, as evidenced by Mössbauer spectroscopy and magnetization measurements.Weobserve a bias in the hysteresis when measured at very low temperature in the field cooling protocol (10 kOe). In addition, dc (static) and ac (dynamic) magnetization measurements against temperature and applied field reveal a frustrated order of the system below 10 K. High-resolution transmission electron microscopy (HRTEM) studies reveal that theHNSare composed of small crystalline clusters of about 2 nmin diameter, which behave as individual magnetic entities. Micromagnetic simulations (using conjugate gradient in order to minimize the total energy of the system) reproduce the experimentally observed magnetic behavior. The model considers the hollow particles as constituted by small ordered clusters embedded in an antiferromagnetic environment (spins localized outside the clusters). In addition, the surface spins (in both inner and outer surfaces of theHNS) are affected by a local surface anisotropy. The strong effective magnetic anisotropy field of the clusters induces the bias observed when the system is cooled in the presence of a magnetic external field. This effect propagates through the exchange interaction into the entire particle.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
IOP Publishing
dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by/2.5/ar/
dc.subject
Micromagnetism
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Nanomagnetism
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Nanoparticles
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Astronomía
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Ciencias Físicas
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CIENCIAS NATURALES Y EXACTAS
dc.title
Exchange bias in ferrite hollow nanoparticles originated by complex internal magnetic structure
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2018-08-08T14:14:05Z
dc.journal.volume
2
dc.journal.number
10
dc.journal.pagination
105001/1-105001/11
dc.journal.pais
Reino Unido
dc.journal.ciudad
Londres
dc.description.fil
Fil: de Biasi, Emilio. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte; Argentina. Comisión Nacional de Energía Atómica. Centro Atómico Bariloche; Argentina
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. Centro Atómico Bariloche; Argentina
dc.description.fil
Fil: Vargas, Jose Marcelo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte; Argentina. Comisión Nacional de Energía Atómica. Centro Atómico Bariloche; Argentina
dc.description.fil
Fil: Zysler, Roberto Daniel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte; Argentina. Comisión Nacional de Energía Atómica. Centro Atómico Bariloche; Argentina
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Fil: Arbiol, Jordi. Universidad de Barcelona; España
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Fil: Ibarra, Alfonso. Universidad de Zaragoza. Instituto de Nanociencia de Aragón; España
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Fil: Goya, Gerardo Fabian. Universidad de Zaragoza. Instituto de Nanociencia de Aragón; España
dc.description.fil
Fil: Ibarra, Ricardo M.. Universidad de Zaragoza. Instituto de Nanociencia de Aragón; España
dc.journal.title
Materials Research Express
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/http://www.iopscience.iop.org/article/10.1088/2053-1591/2/10/105001/
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1088/2053-1591/2/10/105001
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