Regensburg 2022 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 28: Magnonics 2
MA 28.5: Vortrag
Donnerstag, 8. September 2022, 10:30–10:45, H43
The Optimization of Yttrium Iron Garnet Spin-wave Lenses for Amplification of Spin Waves — •Stephanie Lake1, Philipp Geyer1, Rouven Dreyer1, Niklas Liebing1, Philip Trempler1, Evangelos Papaioannou1, Georg Woltersdorf1, and Georg Schmidt1,2 — 1Institut für Physik, Martin-Luther-Universität Halle-Wittenberg, 06120 Halle, Germany — 2Interdisziplinäres Zentrum für Materialwissenschaften, MartinLuther-Universität Halle-Wittenberg, 06120 Halle, Germany
Exciting magnons in magnetic materials for high-frequency applications is inefficient; one way to improve the process is to focus a manifold of spin waves. Following this idea, we create a magnon counterpart to the nonimaging Fresnel lens concentrator called a "spin-wave lens."
We simulate spin-wave (SW) propagation through funnel-like SW lenses based on the material Yttrium Iron Garnet (YIG) using Mumax [1]. When a frequency of 3.25 GHz and field of 51.62 mT are applied, SW modes with wavelengths 9.4 µm are excited, and furthermore, have a 384-fold increase in their intensity relative to the structure’s start.
To test the simulation’s accuracy, we fabricate SW lenses out of YIG [2] and measure the precession of excited SWs by a magneto-optic Kerr effect (MOKE) measurement scheme. We conduct several parameter sweeps of geometric characteristics and experimental conditions and currently attain a 51-fold increase in intensity near the funnel’s exit for a frequency of 3.68 GHz and magnetic field of 66.15 mT.
[1] A. Vansteenkiste, et al., AIP Adv. 4, 107133 (2014).
[2] F. Heyroth, et al., Phys. Rev. Appl. 12, 054031 (2019).