Regensburg 2019 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 37: Focus Session: Insulator Spintronics
MA 37.3: Vortrag
Mittwoch, 3. April 2019, 16:45–17:00, H38
Hybridization of Ferro- and Antiferromagnetic Magnon Modes in GdIG — •Lukas Liensberger1,2, Akashdeep Kamra3, Hannes Maier-Flaig1,2, Stephan Geprägs1,2, Andreas Erb1, Sebastian T. B. Goennenwein4, Rudolf Gross1,2,5, Wolfgang Belzig6, Hans Huebl1,2,5, and Mathias Weiler1,2 — 1Walther-Meißner-Institut — 2Physik-Department, Technische Universität München — 3Center for Quantum Spintronics, Norwegian University of Science and Technology — 4Institut für Festkörper- und Materialphysik, Technische Universität Dresden — 5Nanosystems Initiative Munich — 6Department of Physics, University of Konstanz
The ability to tailor the static and dynamic magnetic properties of rare-earth iron garnets has stimulated a multitude of research studies and resulted in numerous applications. One prime example of this material class is the compensated ferrimagnet gadolinium iron garnet (GdIG). We investigate the magnetization dynamics of a single crystal GdIG disk using broadband magnetic resonance and study in particular the dispersion relation of the ferro- and the antiferromagnetic modes. Close to the magnetization compensation temperature Tc we observe a strong and tunable interaction of these two modes. We explain our observations by employing a two-sublattice model for the ferrimagnet and find good agreement with theory. A weak, anisotropy-induced coupling is exchange enhanced close to Tc and yields strong coupling. The clock- and counterclockwise precessing modes thereby hybridize into linearly oscillating modes.
We acknowledge financial support by the DFG via project WE5386/4.