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dc.contributor.author
Brandt, Iuri S.  
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Tumelero, Milton A.  
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Lima, Enio Junior  
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da Silva, Douglas L.  
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Zysler, Roberto Daniel  
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Faccio Sgiorovello, Ricardo Juan  
dc.contributor.author
Pasa, André A.  
dc.date.available
2019-05-02T16:07:16Z  
dc.date.issued
2017-11-26  
dc.identifier.citation
Brandt, Iuri S.; Tumelero, Milton A.; Lima, Enio Junior; da Silva, Douglas L.; Zysler, Roberto Daniel; et al.; Enhanced defect-mediated ferromagnetism in Cu2O by Co doping; Elsevier Science; Journal of Magnetism and Magnetic Materials; 441; 26-11-2017; 374-386  
dc.identifier.issn
0304-8853  
dc.identifier.uri
http://hdl.handle.net/11336/75396  
dc.description.abstract
In this work an extensive characterization of Co doped Cu2O thin films grown by electrochemical deposition is presented. The doped films showed ferromagnetic behavior, with impressive Curie temperature up to 700 K. Undoped samples also presented magnetic moments at room temperature, but much reduced when compared to doped ones. The observed magnetism in undoped and doped samples was taken as an indicative of a defect-mediated ferromagnetism. Moreover, the sample magnetization was reduced as a consequence of a decreasing in defect density due to thermal annealing. Polarization-dependent X-ray absorption measurements demonstrated that oxygen derived states are the source of the observed magnetic moment and its magnetic dichroism depends on the amount of point defects. Structural, optical and electrical characterization provides information that confirms the incorporation of Co atoms in the Cu2O lattice, without the formation of secondary segregated Co phases. In addition, Electron Paramagnetic Resonance and Glow Discharge Optical Emission Spectroscopy measurements reject the existence of contaminants in the films, dismissing them as the source for the observed magnetism. Computational calculations have shown that Co doping shall locally increases the amount of defects, such as interstitial O, leading to highly oxidized regions from where the unpaired spin arises. This situation generates a picture similar to the magnetic polaron theory, but with the dopant ion pinning the defects.  
dc.format
application/pdf  
dc.language.iso
eng  
dc.publisher
Elsevier Science  
dc.rights
info:eu-repo/semantics/openAccess  
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/  
dc.subject
Cuprous Oxide  
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Dft  
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Electrodeposition  
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Ferromagnetism  
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Point Defects  
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Astronomía  
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Ciencias Físicas  
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CIENCIAS NATURALES Y EXACTAS  
dc.title
Enhanced defect-mediated ferromagnetism in Cu2O by Co doping  
dc.type
info:eu-repo/semantics/article  
dc.type
info:ar-repo/semantics/artículo  
dc.type
info:eu-repo/semantics/publishedVersion  
dc.date.updated
2019-04-11T19:51:00Z  
dc.journal.volume
441  
dc.journal.pagination
374-386  
dc.journal.pais
Países Bajos  
dc.journal.ciudad
Amsterdam  
dc.description.fil
Fil: Brandt, Iuri S.. Universidade Federal de Santa Catarina; Brasil  
dc.description.fil
Fil: Tumelero, Milton A.. Universidade Federal de Santa Catarina; Brasil. Universidade Federal do Rio Grande do Sul; Brasil  
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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 Energía Nuclear. Instituto Balseiro; Argentina. Comisión Nacional de Energía Atómica. Centro Atómico Bariloche; Argentina  
dc.description.fil
Fil: da Silva, Douglas L.. Universidade Federal de Pelotas; Brasil  
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. Gerencia del Área de Energía Nuclear. Instituto Balseiro; Argentina. Comisión Nacional de Energía Atómica. Centro Atómico Bariloche; Argentina  
dc.description.fil
Fil: Faccio Sgiorovello, Ricardo Juan. Universidad de la República. Facultad de Química; Uruguay  
dc.description.fil
Fil: Pasa, André A.. Universidade Federal de Santa Catarina; Brasil  
dc.journal.title
Journal of Magnetism and Magnetic Materials  
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1016/j.jmmm.2017.05.057  
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info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S0304885316333741