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MA: Fachverband Magnetismus
MA 16: Magnonics I
MA 16.9: Vortrag
Dienstag, 19. März 2024, 11:45–12:00, EB 107
Magnon spin capacitor — •Pieter M. Gunnink1, Tim Ludwig2, and Rembert A. Duine2,3 — 1Institute of Physics, Johannes Gutenberg-University Mainz, Staudingerweg 7, Mainz 55128, Germany — 2Institute for Theoretical Physics and Center for Extreme Matter and Emergent Phenomena, Utrecht University, Leuvenlaan 4, 3584 CE Utrecht, The Netherlands — 3Department of Applied Physics, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands
We show that a magnon spin capacitor can be realized at a junction between two exchange coupled ferromagnets [Gunnink et al., arXiv:2310.09064]. In this junction, the buildup of magnon spin over the junction is coupled to the difference in magnon chemical potential, realizing the magnon spin analogue of an electrical capacitor. We analyse the junction in detail by considering spin injection and detection from normal metal leads, the tunnelling current across the junction and magnon decay within the ferromagnet, showing that such a structure realizes a magnon spin RC circuit. Choosing platinum and yttrium iron garnet as the normal metal and ferromagnet, we numerically calculate the RC time, which ranges from picoseconds to microseconds, depending on the area of the junction. We therefore conclude that the magnon spin capacitor has clear experimental signatures and could directly be of use in applications.
Keywords: Magnonics; Spin capacitor; Magnon spin valve; Spin injection and detection