Regensburg 2025 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 32: Spin Transport and Orbitronics, Spin-Hall Effects II (joint session MA/TT)
MA 32.5: Vortrag
Mittwoch, 19. März 2025, 18:30–18:45, H19
Impact of the substrate on angular momentum transport between separated ferromagnets — •Fiona Sosa Barth1,2, Matthias Grammer1,2, Richard Schlitz3, Tobias Wimmer1,2, Janine Gückelhorn1,2, Luis Flacke1,2, Sebastian T.B. Goennenwein3, Rudolf Gross1,2,4, Hans Huebl1,2,4, Akashdeep Kamra5, and Matthias Althammer1,2 — 1Walther-Meißner-Institut, BAdW, Garching, Germany — 2School of Natural Sciences, TUM, Garching, Germany — 3Department of Physics, University of Konstanz, Konstanz, Germany — 4Munich Center for Quantum Science and Technology, München, Germany — 5RPTU Kaiserslautern-Landau, Kaiserslautern, Germany
Spintronics relies on the transfer of angular momentum between electrons and solid state excitations such as magnons and phonons. In our recent work, we demonstrate angular momentum transfer between two ferromagnetic strips on diamagnetic substrates [1] by converting a DC current at one of the electrodes to a non-equilibrium magnon accumulation. Due to dipolar and potentially phononic coupling, angular momentum is transferred to the magnonic system of the second FM electrode and measured by the inverse processes. In this work, we investigate the substrate influence on the angular momentum transport by comparing our results for SiOx and SiN layers on Si substrates. As a next step, we investigate substrate-supported strips versus freestanding strings to separate phononic contributions from dipolar coupling. [1] R. Schlitz et al., Phys. Rev. Lett. 132, 256701 (2024)
Keywords: Spintronics; Angular momentum; Ferromagnetic strips; Freestanding strings