  We investigate the coupled magnetization dynamics in heterostructures of a
single crystal of the chiral magnet $\mathrm{Cu_2OSeO_3}$ (CSO) and a
polycrystalline ferromagnet $\mathrm{NiFe}$ (Py) thin film using broadband
ferromagnetic resonance (FMR) at cryogenic temperatures. We observe the
excitation of a hybrid mode (HM) below the helimagnetic transition temperature
of CSO. This HM is attributed to the spin dynamics at the CSO/Py interface. We
study the HM by measuring its resonance frequencies for in plane rotations of
the external magnetic field. We find that the HM exhibits dominantly four-fold
anisotropy, in contrast to the FMR of CSO and Py.
