Berlin 2024 – scientific programme

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MA: Fachverband Magnetismus

MA 23: Magnonics II

MA 23.4: Talk

Wednesday, March 20, 2024, 10:15–10:30, EB 107

Fabrication and Characterization of Suspended YIG Microstructures — •Seth W. Kurfman¹, Frank Heyroth², and Georg Schmidt^{1, 2} — ¹Institut für Physik, Martin Luther Universität Halle-Wittenberg, Halle, Germany — ²Interdisziplinäres Zentrum für Materialwissenschaften, Martin-Luther-Universität Halle-Wittenberg, Halle, Germany

Efficient coupling between magnetic excitations and acoustic modes is hindered by enhanced phonon loss into the substrate bulk. These losses can be minimized through the fabrication of suspended magnonic microstructures where the acoustic modes of the magnonic material are isolated from the substrate.

Here, we demonstrate the fabrication of low-loss suspended YIG microstructures with a single attached support point. We additionally show characterization of excited magnon modes via optical techniques (e.g. TR-MOKE) and inductive measurements. Due to confinement effects, these structures exhibit acoustic resonant modes in the GHz regime and therefore provide an avenue towards efficient coupling of magnetic and acoustic modes. In conjunction with optical techniques (e.g. Brillouin Light Scattering) to measure the acoustic modes, these YIG microstructures promise application potential ranging from efficient microwave-to-optical light frequency conversion [1] to quantum systems utilizing coherent multipartite coupling [2].

References:

[1] Engelhardt et al., Phys. Rev. Appl. 18, 044059 (2022).

[2] Lachance-Quirion et al., Appl. Phys. Express 12, 070101 (2019).

Keywords: magneto-acoustics; micro- and nanopatterning