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hal.structure.identifierCentre de physique moléculaire optique et hertzienne [CPMOH]
dc.contributor.authorADER, Jean-Pierre
hal.structure.identifierCentre de physique moléculaire optique et hertzienne [CPMOH]
hal.structure.identifierInstitut universitaire de France [IUF]
dc.contributor.authorBUZDIN, Alexandre I.
dc.date.issued2006
dc.identifier.issn0304-8853
dc.description.abstractEnUsing a simple Landau model, we discuss the different possibilities of generating magnetic effects at a second-order transition for films. Varying the sample size d and/or surface coupling g one can decrease or increase substantially the surface critical temperature Ts and the saturation magnetization Ms. In the case of g40, Ms and Ts decrease from the bulk values as the film thickness is reduced. These theoretical results are in nice agreement with the experimental data on superconducting MgB2 thin films. By contrast, for go0, an enhancement of both quantities is expected. This extraordinary transition has rarely been observed experimentally and, usually, the situation is far from being clear. We analyze a new experiment on NiFe2O4 ultra-thin films, where a very strong enhancement of the saturation magnetization is observed.
dc.language.isoen
dc.publisherElsevier
dc.subject.enLandau theory
dc.subject.enMagnetic thin films
dc.subject.enSuperconductivity
dc.title.enSurface magnetic phase transitions in films
dc.typeArticle de revue
dc.identifier.doi10.1016/j.jmmm.2005.10.057
dc.subject.halPhysique [physics]/Matière Condensée [cond-mat]/Supraconductivité [cond-mat.supr-con]
bordeaux.journalJournal of Magnetism and Magnetic Materials
bordeaux.page170-173
bordeaux.volume300
bordeaux.peerReviewedoui
hal.identifierhal-00401508
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-00401508v1
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