Description
Investigating the dynamic behaviors of ferromagnetic (FM)/antiferromagnetic (AFM) bilayers is essential for spintronics and understanding nanoscale magnetic dynamics. We investigated the dynamic behaviors of exchange spirals in a single-crystalline Fe/CoO bilayer, where Fe FM spins and CoO AFM spins are perpendicularly coupled due to the spin-flop coupling. Field cooling along the Fe <100> direction induces in-plane uniaxial anisotropy at the interface, enabling the formation of exchange spirals under an external magnetic field. Using vector network analyzer (VNA)-ferromagnetic resonance (FMR) measurements, we observed a frequency dip accompanied by discontinuities and increased linewidth in the FMR spectrum of the exchange spirals. Micromagnetic simulation with Mumax3 confirmed these findings, revealing the spin structure and dynamic modes of the exchange spirals under various magnetic field configurations. Our study provides insights into the spin dynamics properties of FM/AFM bilayers and their potential applications in spintronics.
