Magnetic and structural studies on nanostructured Gd/Cr multilayer films

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dc.contributor.authorGadioli, G. Z.
dc.contributor.authorRouxinol, F. P.
dc.contributor.authorGelamo, R. V.
dc.contributor.authorCardoso, L. P.
dc.contributor.authorGama, S. [UNIFESP]
dc.contributor.authorMoraes, M. A. Bica de
dc.contributor.institutionUniversidade Estadual de Campinas (UNICAMP)
dc.contributor.institutionInst Ciencias Tecnol & Exatas
dc.contributor.institutionUniversidade Federal de São Paulo (UNIFESP)
dc.date.accessioned2016-01-24T14:34:35Z
dc.date.available2016-01-24T14:34:35Z
dc.date.issued2013-10-31
dc.description.abstractInvestigations of magnetic phases, transition temperatures and coercivity were performed inmultilayered Gd/Cr films as a function of the crystalline state and morphology of the Gd layers. the films were deposited by dc magnetron sputtering at three substrate temperatures, T-s, (room temperature, 300 and 500 degrees C). the Gd and Cr thicknesses were of 10 and 30 nm, respectively. Two series of three films were prepared. in one of the series, the films had a single Gd/Cr bilayer; in the other, 15 bilayers. the discontinuous or granular nature of the Gd layers was revealed by scanning electron microscopy Grazing incidence angle x-ray diffraction was used to investigate the crystalline state of the Gd and Cr layers. These techniques revealed that grain average size and crystalline order increase with increasing T-s. From dc magnetic measurements, the co-existence of ferromagnetic and superferromagnetic phases in the Gd layers was observed, and Curie transition temperatures, T-C, were determined. High coercive fields at low temperature (2 K) were measured in hysteresis cycles. Field-cooled and zero field-cooled magnetizations as functions of temperature curves exhibited, for some of the samples, a low temperature peak suggesting a freezing transition to a cluster glass state. This was confirmed by complementary ac-susceptibility measurements carried out as a function of temperature, for various frequencies of the ac field. Some results of this work - the decline in TC for decreasing Gd grain size, the high coercive field and its dependence on particle size, and the behavior of the magnetization at low temperatures for the sample deposited at room temperature - are discussed in terms of finite size and surface effects in nanosized particles. Published by Elsevier B.V.en
dc.description.affiliationUniv Estadual Campinas, Inst Fisica Gleb Wataghin, BR-13083970 Campinas, SP, Brazil
dc.description.affiliationUniv Estadual Campinas, Ctr Semicond Components, BR-13083970 Campinas, SP, Brazil
dc.description.affiliationInst Ciencias Tecnol & Exatas, BR-38064200 Uberaba, MG, Brazil
dc.description.affiliationUniversidade Federal de São Paulo, BR-09972270 Diadema, SP, Brazil
dc.description.affiliationUnifespUniversidade Federal de São Paulo, BR-09972270 Diadema, SP, Brazil
dc.description.sourceWeb of Science
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.description.sponsorshipCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
dc.description.sponsorshipConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.format.extent496-502
dc.identifierhttp://dx.doi.org/10.1016/j.tsf.2013.07.066
dc.identifier.citationThin Solid Films. Lausanne: Elsevier Science Sa, v. 545, p. 496-502, 2013.
dc.identifier.doi10.1016/j.tsf.2013.07.066
dc.identifier.issn0040-6090
dc.identifier.urihttp://repositorio.unifesp.br/handle/11600/36885
dc.identifier.wosWOS:000324820800082
dc.language.isoeng
dc.publisherElsevier B.V.
dc.relation.ispartofThin Solid Films
dc.rightsinfo:eu-repo/semantics/restrictedAccess
dc.rights.licensehttp://www.elsevier.com/about/open-access/open-access-policies/article-posting-policy
dc.subjectMagnetic intermetallicsen
dc.subjectNanostructured intermetallicsen
dc.subjectMagnetic propertiesen
dc.subjectTextureen
dc.subjectNanocrystalsen
dc.subjectThin filmsen
dc.subjectMicrostructureen
dc.subjectMagnetic applicationsen
dc.titleMagnetic and structural studies on nanostructured Gd/Cr multilayer filmsen
dc.typeinfo:eu-repo/semantics/article
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