We investigate the spin dynamics of novel magnon hybrid systems using electrical detection techniques in the microwave regime and spatially resolved optical spectroscopy methods. We observe exchange-enhanced ultrastrong magnon-magnon coupling in gadolinium iron garnet. We further demonstrate a tuneable cooperativity of the magnon-photon coupling between a 3D microwave cavity and the skyrmion host material Cu2OSeO3. We also developed novel optical spectroscopy techniques to spatially resolve the (non-)linear spin wave dynamics in a micropatterned magnonic device made of the low-damping ferromagnet CoFe.
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