Surface magnetic phase transitions in films
BUZDIN, Alexandre I.
Centre de physique moléculaire optique et hertzienne [CPMOH]
Institut universitaire de France [IUF]
Centre de physique moléculaire optique et hertzienne [CPMOH]
Institut universitaire de France [IUF]
BUZDIN, Alexandre I.
Centre de physique moléculaire optique et hertzienne [CPMOH]
Institut universitaire de France [IUF]
< Leer menos
Centre de physique moléculaire optique et hertzienne [CPMOH]
Institut universitaire de France [IUF]
Idioma
en
Article de revue
Este ítem está publicado en
Journal of Magnetism and Magnetic Materials. 2006, vol. 300, p. 170-173
Elsevier
Resumen en inglés
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 ...Leer más >
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.< Leer menos
Palabras clave en inglés
Landau theory
Magnetic thin films
Superconductivity
Orígen
Importado de HalCentros de investigación