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MA: Fachverband Magnetismus
MA 23: Magnonics II
MA 23.3: Vortrag
Mittwoch, 20. März 2024, 10:00–10:15, EB 107
Higher harmonics generation from low intensity spin waves using a magnon concentrator — •Stephanie Lake1, Seth Kurfman1, Rouven Dreyer1, Georg Woltersdorf1, and Georg Schmidt1,2 — 1Institut für Physik, Martin-Luther-Universität Halle-Wittenberg, 06120 Halle, Germany — 2Interdisziplinäres Zentrum für Materialwissenschaften, Martin-Luther-Universität Halle-Wittenberg, 06120 Halle, Germany
Nonlinear magnon interactions, such as magnon-magnon scattering, are well-documented processes in yttrium iron garnet (YIG) films and microstructures[1,2]. In many of these studies, high frequency signals induce ferromagnetic resonance, causing nonlinear processes to occur. However, this method of excitation lacks spatial resolution and typically requires high initial magnon intensities due to propagation losses.
In this work, we demonstrate nonlinear higher harmonic generation from low-intensity spin waves (SWs). First we fabricate a funnel-shaped YIG device, i.e. magnon concentrator, which employs demagnetizing fields to collect and steer SWs. Then with magneto-optical Kerr effect (MOKE) microscopy and micromagnetic simulations, we investigate the propagation of low-intensity SWs through the concentrator, where they ultimately cross the nonlinearity threshold at the focus. These results can facilitate magnonic applications where both precision and nonlinearities are required.
[1] Ordóñez-Romero, César L., et al. Physical Review B 79.14 (2009).
[2] Liu, HJ Jason, et al. Physical Review B 99.2 (2019).
Keywords: YIG; magnon concentrator; harmonic generation; nonlinearities