[Diffusion de neutrons sur des surfaces magnétiques]
Dans les années 1980, les techniques de dépôt en films minces métalliques ont été développées. La combinaison de différents types de matériaux a conduit à l'apparition de nouveaux phénomènes tels que les couplages magnétiques dans les super-réseaux ou le couplage d'échange entre couches ferro et anti-ferromagnétiques. Le domaine a été très actif en raison des applications industrielles dans le domaine des capteurs magnétiques. De nouvelles hétéro-structures combinant des oxydes magnétiques, des isolants, des semi-conducteurs magnétiques, sont actuellement en développement. En parallèle de la synthèse de ces nouveaux méta-matériaux composés de sandwichs de couches minces, la réflectivité de neutrons polarisés a émergé comme un outil de caractérisation standard de ces systèmes. Dans la période plus récente, les nouveaux développements dans le domaine de la réflectivité de neutrons ont été connectés aux études de micro et de nano-structures, en particulier des structures micro-magnétiques. Des techniques dérivées de la réflectivité spéculaire comme la diffusion hors spéculaire ont été développées pour l'étude de la rugosité ou du micromagnétisme à l'échelle micrométrique. Pour l'étude de nanostructures dans une gamme de tailles caractéristiques inférieures à 100 nm, des techniques comme la diffusion aux petits angles en incidence rasante sont à l'étude.
During the early 1980s, advanced techniques for the deposition of ultra-thin metal films were developed. The combination of different types of materials gave rise to new physical phenomena such as the magnetic exchange coupling in superlattices or the exchange bias between ferro and anti-ferro layers. The field was very active because of the associated industrial applications in magnetic field sensors. New types of heterostructures combining magnetic oxides, insulating oxides or magnetic semiconductors are still being developed. Alongside the fabrication of these new meta-materials made of thin films stacking, polarized neutron reflectometry has emerged as a routine tool for the characterization of magnetic hetero-structures. In the recent years, the new developments of polarized reflectivity have been connected to the study of micro and nanostructures, especially micromagnetic structures in multilayers. The technique of off-specular scattering has been developed for the study of the roughness or the micromagnetism at a micrometric scale. For the study of nanometric structures, in the range below 100 nm, grazing incidence Small Angle Scattering is being considered.
Mot clés : Diffusion de neutrons, Surfaces magnétiques
@article{CRPHYS_2007__8_7-8_763_0,
author = {Fr\'ed\'eric Ott},
title = {Neutron scattering on magnetic surfaces},
journal = {Comptes Rendus. Physique},
pages = {763--776},
publisher = {Elsevier},
volume = {8},
number = {7-8},
year = {2007},
doi = {10.1016/j.crhy.2007.09.002},
language = {en},
}
Frédéric Ott. Neutron scattering on magnetic surfaces. Comptes Rendus. Physique, Volume 8 (2007) no. 7-8, pp. 763-776. doi : 10.1016/j.crhy.2007.09.002. https://comptes-rendus.academie-sciences.fr/physique/articles/10.1016/j.crhy.2007.09.002/
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