Propagation d'onde de spin et interferométrie
Auteur / Autrice : | Rémy Lassalle-Balier |
Direction : | Claude Fermon |
Type : | Thèse de doctorat |
Discipline(s) : | Physique du solide |
Date : | Soutenance en 2011 |
Etablissement(s) : | Paris 6 |
Mots clés
Mots clés contrôlés
Résumé
This work aims to observe spin wave interferences in confined magnetic structures. The way to this goal has led to the design of a new spin wave emitter and receiver that allows observation of MsBVW that are usually hard to excite. This transducer has been modeled by generalizing an existing spin wave transduction. The use of constant demagnetizing factor has been identified as its main limits as it does not consider properly confinement effect. Then, spin wave emission and reception has been characterized in continuous wave approach. To complete this study of propagating spin wave in confined magnetic structures, a second set-up, in time domain, has been used to observe spin wave in pulsed mode. This has led to characterization of spin wave spectrum evolution during transient. Finally, two kinds of spin wave interference have been described and two type of interferometer have been designed. Field addition interferences have been observed experimentally in the case of MsSW. All this work was done using only permalloy because it is a ferromagnetic metallic alloy. This means, it is easily deposited by sputtering or evaporation that are two methods widely used in microelectronic industry. Even if this material has a high damping, it would be more likely adopted by industry than low damping material such as YIG that requires heavy deposition technique, epitaxy.