We investigate magnetization dynamics of Mn2Au/Py (Ni80Fe20) thin film bilayers using broadband ferromagnetic resonance (FMR) and Brillouin light scattering spectroscopy. Our bilayers exhibit two resonant modes with zero-field frequencies up to almost 40 GHz, far above the single-layer Py FMR. Our model calculations attribute these modes to the coupling of the Py FMR and the two antiferromagnetic resonance (AFMR) modes of Mn2Au. The coupling-strength is in the order of 1.6 T⋅nm at room temperature for nm-thick Py. Our model reveals the dependence of the hybrid modes on the AFMR frequencies and interfacial coupling as well as the evanescent character of the spin waves that extend across the Mn2Au/Py interface
@article{arxiv.2302.07915,
title = {Coupling of ferromagnetic and antiferromagnetic spin dynamics in Mn$_{2}$Au/NiFe thin-film bilayers},
author = {Hassan Al-Hamdo and Tobias Wagner and Yaryna Lytvynenko and Gutenberg Kendzo and Sonka Reimers and Moritz Ruhwedel and Misbah Yaqoob and Vitaliy I. Vasyuchka and Philipp Pirro and Jairo Sinova and Mathias Kläui and Martin Jourdan and Olena Gomonay and Mathias Weiler},
journal= {arXiv preprint arXiv:2302.07915},
year = {2023}
}