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MA: Fachverband Magnetismus

MA 9: Magnonics I

MA 9.8: Vortrag

Montag, 9. März 2026, 17:00–17:15, HSZ/0004

All-YIG based functional magnonic crystals — •Rouven Dreyer, Bikash Das Mohapatra, Seth Kurfman, Georg Schmidt, and Georg Woltersdorf — Martin Luther University Halle-Wittenberg, Institute of Physics, 06120 Halle, Germany

For novel magnon-based applications, such as neuromorphic or reservoir computing, so far metallic ferromagnets with large saturation magnetization and high magnonic damping are the material of choice in order to locally manipulate the amplitude and phase of a propagating spin wave in an Yttrium-Iron-Garnet (YIG) layer underneath. Such YIG-metal heterostructures allow for sufficient control of band gaps in spin-wave dispersion in magnon-based Fabry-Perot-resonators or magnonic crystals [1]. In this work, we demonstrate an all-YIG based heterostructure, which imprints phase shifts and amplitude suppression on propagating waves due to the coupling of the device to the chiral spin wave. Thus, the YIG structure acts as a chiral magnonic resonator (CMR). These CMRs can be combined to realize magnonic crystals and allow for active control of individual gaps. To achieve this, the micron-sized YIG CMRs may be initialized in a different field state with respect to the YIG layer. In particular, an antiparallel magnetization alignment allows for sufficient suppression of a propagating Damon-Eshbach spin wave, as demonstrated by using spatially- and frequency-resolved SNS-MOKE [2].

[1] H. Qin et al., Nat. Commun. 12, 2293 (2021)

[2] R. Dreyer et al., PRM 5, 064411 (2021)

Keywords: Magnonics; Spin wave; SNS-MOKE; Chiral Magnonic Resonator; Magnonic Crystal