Phase separation in Cu/sub 90/Co/sub 10/ high-magnetoresistance materials
dc.contributor.author | Miranda, Marines Grande Malcum | pt_BR |
dc.contributor.author | Estevez Rams, Ernesto | pt_BR |
dc.contributor.author | Martinez Pino, Gerardo Guido | pt_BR |
dc.contributor.author | Baibich, Mario Norberto | pt_BR |
dc.date.accessioned | 2014-10-08T02:11:15Z | pt_BR |
dc.date.issued | 2003 | pt_BR |
dc.identifier.issn | 1098-0121 | pt_BR |
dc.identifier.uri | http://hdl.handle.net/10183/104260 | pt_BR |
dc.description.abstract | The relation between giant magnetoresistance ~GMR! and phase separated nanostructures in Cu90Co10 is studied using magnetotransport measurements together with transmission electron microscopy and x-ray microanalysis. The samples were melt-spun ribbons isochronally annealed up to 873 K, and all show in their grains a homogeneous spinodal decomposition characterized by long parallel Co-excess stripes. These stripes have 40-nm modulation periods and develop along the crystalline directions of each grain. Different anneals do not change appreciably the observed microstructures, while the magnetoresistance is initially enhanced by a factor of 2, followed by a 35% drop above 823 K. The latter coincides with the observation of a secondary lamellar decomposition of 4 nm modulation length. We propose that the GMR effects in CuCo alloys originate from these nanoscopic modulations of the constituents induced by nonequilibrium processes. | en |
dc.format.mimetype | application/pdf | pt_BR |
dc.language.iso | eng | pt_BR |
dc.relation.ispartof | Physical review. B, Condensed matter and materials physics. Woodbury. Vol. 68, no. 1 (July 2003), 014434, 8 p. | pt_BR |
dc.rights | Open Access | en |
dc.subject | Ligas de cobalto | pt_BR |
dc.subject | Ligas de cobre | pt_BR |
dc.subject | Separação de fases | pt_BR |
dc.subject | Decomposicao spinodal | pt_BR |
dc.subject | Microscopia eletrônica de transmissão | pt_BR |
dc.subject | Análise química por raios x | pt_BR |
dc.title | Phase separation in Cu/sub 90/Co/sub 10/ high-magnetoresistance materials | pt_BR |
dc.type | Artigo de periódico | pt_BR |
dc.identifier.nrb | 000379548 | pt_BR |
dc.type.origin | Estrangeiro | pt_BR |
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