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Séminaire interne Spintec

Spin currents generation and (Self)Torque in GdFeCo ferrimagnet

Jeudi 30 mars 2023 à 16:00, Salle de séminaire 445, bâtiment 1005, CEA-Grenoble

Publié le 30 mars 2023
Sebastien Petit Wattelot
Institut Jean Lamour, Université de Lorraine
Spin-heat coupling is important from a fundamental perspective as well as for many thermoelectric and thermomagnetic applications. Can we generate local heat with magnetic nanoparticles or ‘super spins’? What about manipulation of spin transport using thermal gradients? In this talk, I will provide some insights into these questions based on our research in a number of systems ranging from nanostructures to heterostructures including anisotropic nanoparticles, compensated ferrimagnets, topological systems, spin gapless semiconductors, interfaces of graphene, 2D TMD materials on ferrites and garnets. The common theme is our ability to sensitively measure and tune the effective intrinsic and interfacial magnetic anisotropy in a large class of magnetic materials including bulk, nanoparticle assemblies and thin film heterostructures. I will describe how we combine conventional and relatively unconventional experimental techniques like magnetometry, RF transverse susceptibility, magnetocaloric effect, anomalous Nernst effect (ANE), spin Seebeck effect (SSE), FMR spin pumping (FMR-SP) to probe the fundamental physics of spin dynamics, spin-heat coupling, thermal spin transport across interfaces. Some recent results on our ongoing projects including core-shell and anisotropic nanoparticles, influence of magnetic anisotropy on spin Seebeck effect (SSE) and anomalous Nernst effect (ANE), universal scaling of SSE in compensated ferrimagnets, estimation of magnon propagation length will be discussed.

Plus d'information :https://www.spintec.fr/seminar-spin-currents-generation-and-selftorque-in-gdfeco-ferrimagnet/

Pour suivre le seminaire en visioconférence : https://univ-grenoble-alpes-fr.zoom.us/j/3241920232

(*) Persons who do not have a CEA badge must request an entry authorization sufficiently in advance, before March 07 at admin.spintec@cea.fr