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MA: Fachverband Magnetismus

MA 45: Magnonics I

MA 45.9: Vortrag

Donnerstag, 19. März 2020, 11:45–12:00, HSZ 401

Detection of magnons in thin ferromagnetic films by ferromagnetic resonance measurements — •Sergej Andreev, Julian Braun, Elke Scheer, and Torsten Pietsch — Physics Department, University of Konstanz, 78457 Konstanz, Germany

We report measurements of the ferromagnetic resonance (FMR) of thin ferromagnetic films and bilayers of Ni, Co, Py and NiCo by FMR measurements in a broadband resonator from 2 to 40 GHz with an applied magnetic field in plane at 4 K and deduce their spin wave spectra from these data. We obtain information on the magnetization and the Gilbert damping of perpendicular polarized magnons. Superimposed onto the spin wave absorption lines, we observe an amplification of the FMR signal with a Fano resonance shape at distinct frequencies, which are absent without the ferromagnetic fields. We interpret this finding as an enhancement and modification of the resonator properties by the coupling to the ferromagnetic layer.