« avril 2024 »
L M M J V S D
1 2 3 4 5 6 7
8 9 10 11 12 13 14
15 16 17 18 19 20 21
22 23 24 25 26 27 28
29 30 1 2 3 4 5
 
Tous les évènements de Physique à venir

Tous les évènements de Biologie / Chimie à venir

Tous les évènements à venir

Les évènements relevant de la Physique et de la Biologie / Chimie sont représentés en turquoise

Surface-Acoustic-Wave Induced Ferromagnetic Resonance and possible magnonic applications

Mardi 7 novembre 2023 11:00 - Duree : 1 heure
Lieu : Salle de séminaire 445, bâtiment 1005, CEA Grenoble, 17 avenue des Martyrs, Grenoble

Orateur : Massimiliano MARANGOLO (Sorbonne Université)

Séminaire invité IRIG/SPINTEC :

Visioconference link : https://webconf.cea.fr/ioan-lucian....

Access : Persons who do not have a CEA pass must request an entry authorization sufficiently in advance, at admin.spintec@cea.fr

Résumé :

The interaction between Surface Acoustic Waves (SAW) and Spin Waves (SW) in heterostructures composed of piezoelectric and magnetostrictive materials will be discussed in the framework of the SAW-induced Ferromagnetic Resonance (FMR) and SW-generation. It is well established that Interdigitated Transducers (IDT) exciting SAW in the GHz and sub-GHz regime in a piezoelectric media (see IDT in Fig.1), permit SAW-FMR in ferromagnetic thin films, as Ni and GaMnAs. [1,2] Here, I will focus on recent experiments on Fe thin films epitaxied on a piezoelectric GaAs(001) substrate that have demonstrated efficient resonant MEC through SAW.[3,4] This study investigates the impact of an external magnetic field on the velocity and the amplitude of surface acoustic waves (SAWs). The SAW velocity is found to be strongly influenced by both the amplitude and direction of the magnetic field. To explain these observations, the study employs a phenomenological model that considers the relative change in SAW velocity, with a key factor being the inclusion of spin-wave dispersion. The validity of this model is confirmed through comparisons with a fully magnetoelastic model. Additionally, the study explores the nonreciprocity of SAWs’ propagation both experimentally and theoretically. Concerning magnonic applications, we note that SAWs can propagate over long distances in piezoelectric materials like LiNbO3 or GaAs. Consequently, SAWs generated by a single Interdigital Transducer (IDT) may interact with thousands of magnonic circuits since SAW spread over millimetres square in a well-controlled manner. These experiments suggest the integration of SAW-FMR mechanism in magnonic devices where SWs, generated by antennas or by dynamic strain could be locally handled, triggered, scattered or even suppressed by SAWs excited, in turn, by remote voltage-driven IDTs.

Plus d’informations : https://www.spintec.fr/seminar-surface-acoustic-wave-induced-ferromagnetic-resonance-and-possible-magnonic-applications/

https://www.cea.fr/drf/irig/Pages/Animation-scientifique/seminaires/2023_Marangolo.aspx

Contact : odile.rossignol@cea.fr

Discipline évènement : (Physique)
Entité organisatrice : (CEA / IRIG)
Nature évènement : (Séminaire)
Site de l'évènement : Site CEA avec accès badge

Prévenir un ami par email

Télécharger dans mon agenda

Cafés sciences de Grenoble | UdPPC de Grenoble | Sauvons Le Climat | Cafe des sciences de Vizille
Accueil du site | Secretariat | Espace privé | Suivre la vie du site RSS 2.0 : Tous les evenements Suivre la vie du site RSS 2.0 : Evenements de Physique Suivre la vie du site RSS 2.0 : Evenements de Biologie & Chimie