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MA: Fachverband Magnetismus

MA 16: Magnonics I

MA 16.4: Talk

Tuesday, March 19, 2024, 10:15–10:30, EB 107

Spatiotemporal magnon propagation dynamics in ultrathin iron garnets — •Volker Wiechert, Julian Bär, Moritz Cimander, Maurus Mrotzek, and Davide Bossini — Department of Physics, University of Konstanz, D-78457 Konstanz, Germany

Recently, ferrimagnetic iron garnets have emerged as a potential material system to study the dynamics and manipulation of spin waves on their fundamental temporal and spatial scales [1]. Today’s manufacturing processes also make it possible to produce nanometer-thick layers with variable rare-earth doping that exhibit new dynamic properties [2].

Until now, the spatiotemporal control of magnon propagation on fundamental scales has been barely addressed and, almost exclusively, in a linear spin wave regime. We set out to tackle spatiotemporal magnon dynamics in a nonlinear regime with an all-optical approach. The high tunability of the laser system also allows the individual sublattices of the ferrimagnet to be probed and provides further insights into the dynamics of these compounds [3]. Preliminary measurements of local spin dynamics in Gd-doped iron garnet already displayed nonlinear spin dynamics [4].

[1] T. Satoh et al., Nat. Photon. 6, 662 (2012). [2] L. Soumah et al., Phys. Rev. Lett. 127, 077203 (2021) [3] M. Deb et al., J. Phys. D: Appl. Phys. 45, 455001 (2012) [4] V. Wiechert et al., in preparation

Keywords: Ultrafast Magnetism; Iron Garnets; Propagation Dynamics; Nonlinear Spin Dynamics