ADER, Jean-Pierre; BUZDIN, Alexandre I.

doi:10.1016/j.jmmm.2005.10.057

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ADER, Jean-Pierre
Centre de physique moléculaire optique et hertzienne [CPMOH]

BUZDIN, Alexandre I.
Centre de physique moléculaire optique et hertzienne [CPMOH]
Institut universitaire de France [IUF]

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Journal of Magnetism and Magnetic Materials. 2006, vol. 300, p. 170-173

Elsevier

Résumé en anglais

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.< Réduire

Mots clés en anglais

Landau theory

Magnetic thin films

Superconductivity

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Surface magnetic phase transitions in films

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