Magnetic-size effects in ultrathin layers

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dc.contributor.authorGummich, Ute
dc.contributor.authorCabrera, G. G.
dc.contributor.authorGonçalves da Silva, C. E. T.
dc.contributor.authorStein-Barana, Alzira C.M. [UNESP]
dc.contributor.institutionUniversidade Estadual de Campinas (UNICAMP)
dc.contributor.institutionLaboratório Nacional de Luz Síncrotron (LNLS)
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.date.accessioned2014-05-27T11:17:53Z
dc.date.available2014-05-27T11:17:53Z
dc.date.issued1993-08-01
dc.description.abstractWe study N-layer samples (N ≤ 10) for the Heisenberg model, with ferro- and antiferromagnetic exchange couplings, using a modified version of the Onsager reaction field approximation. The present scheme includes short-range spin-spin correlations, and allows for layer-dependent order parameters when free surface boundary conditions are imposed. The limits N = 1 (two dimensions) and N → ∞ (three dimensions) can be solved analytically, while systems with several layers have to be numerically calculated. We found no indication of a phase transition at finite temperature up to the sizes investigated (N = 10), the layered systems behaving essentially as two-dimensional. A phase transition is only obtained for the three-dimensional limit. © 1993.en
dc.description.affiliationInstituto de Física Gleb Wataghin Universidade Estadual de Campinas (UNICAMP), CP 6165, Campinas, 13083-970 São Paulo
dc.description.affiliationLaboratório Nacional de Luz Síncrotron (LNLS), CP 6192, Campinas, 13081 São Paulo
dc.description.affiliationInstituto de Geociências e Ciências Exatas Departamento de Física Universidade Estadual Paulista (UNESP), Rio Claro, 13500-230 São Paulo
dc.description.affiliationUnespInstituto de Geociências e Ciências Exatas Departamento de Física Universidade Estadual Paulista (UNESP), Rio Claro, 13500-230 São Paulo
dc.format.extent335-344
dc.identifierhttp://dx.doi.org/10.1016/0304-8853(93)90108-E
dc.identifier.citationJournal of Magnetism and Magnetic Materials, v. 125, n. 3, p. 335-344, 1993.
dc.identifier.doi10.1016/0304-8853(93)90108-E
dc.identifier.issn0304-8853
dc.identifier.scopus2-s2.0-0027642544
dc.identifier.urihttp://hdl.handle.net/11449/132255
dc.identifier.wosWOS:A1993LW17700016
dc.language.isoeng
dc.publisherElsevier B.V.
dc.relation.ispartofJournal of Magnetism and Magnetic Materials
dc.relation.ispartofjcr3.046
dc.relation.ispartofsjr0,786
dc.rights.accessRightsAcesso restrito
dc.sourceScopus
dc.subjectAntiferromagnetism
dc.subjectCorrelation methods
dc.subjectFerromagnetism
dc.subjectMagnetic couplings
dc.subjectPhase transitions
dc.subjectTemperature
dc.subjectThree dimensional
dc.subjectHeisenberg model
dc.subjectLayer dependent order parameters
dc.subjectMagnetic size effects
dc.subjectOnsager reaction field approximation
dc.subjectSpin-spin correlation
dc.subjectUltrathin layer
dc.subjectMagnetic thin films
dc.titleMagnetic-size effects in ultrathin layersen
dc.typeArtigo
dcterms.licensehttp://www.elsevier.com/about/open-access/open-access-policies/article-posting-policy
dcterms.rightsHolderElsevier B.V.
unesp.campusUniversidade Estadual Paulista (Unesp), Instituto de Geociências e Ciências Exatas, Rio Claropt

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