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Surface magnetic phase transitions in films
| hal.structure.identifier | Centre de physique moléculaire optique et hertzienne [CPMOH] | |
| dc.contributor.author | ADER, Jean-Pierre | |
| hal.structure.identifier | Centre de physique moléculaire optique et hertzienne [CPMOH] | |
| hal.structure.identifier | Institut universitaire de France [IUF] | |
| dc.contributor.author | BUZDIN, Alexandre I. | |
| dc.date.issued | 2006 | |
| dc.identifier.issn | 0304-8853 | |
| dc.description.abstractEn | Using 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.iso | en | |
| dc.publisher | Elsevier | |
| dc.subject.en | Landau theory | |
| dc.subject.en | Magnetic thin films | |
| dc.subject.en | Superconductivity | |
| dc.title.en | Surface magnetic phase transitions in films | |
| dc.type | Article de revue | |
| dc.identifier.doi | 10.1016/j.jmmm.2005.10.057 | |
| dc.subject.hal | Physique [physics]/Matière Condensée [cond-mat]/Supraconductivité [cond-mat.supr-con] | |
| bordeaux.journal | Journal of Magnetism and Magnetic Materials | |
| bordeaux.page | 170-173 | |
| bordeaux.volume | 300 | |
| bordeaux.peerReviewed | oui | |
| hal.identifier | hal-00401508 | |
| hal.version | 1 | |
| hal.popular | non | |
| hal.audience | Internationale | |
| hal.origin.link | https://hal.archives-ouvertes.fr//hal-00401508v1 | |
| bordeaux.COinS | ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Journal%20of%20Magnetism%20and%20Magnetic%20Materials&rft.date=2006&rft.volume=300&rft.spage=170-173&rft.epage=170-173&rft.eissn=0304-8853&rft.issn=0304-8853&rft.au=ADER,%20Jean-Pierre&BUZDIN,%20Alexandre%20I.&rft.genre=article |
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