Strong Interlayer Magnon-Magnon Coupling in Magnetic Hybrid Nanostructures*

Strong couplings between magnons and photons have recently attracted lots of attention due to potential applications in quantum computing by utilizing coherent couplings between spins and superconducting qubits. Here, I will present our recent experimental results on strong interlayer magnon-magnon coupling in an on-chip nanomagnonic device at room temperature [1]. Ferromagnetic nanowire arrays are integrated on a 20-nm-thick yttrium iron garnet (YIG) thin film strip. Large anticrossing gaps up to 1.58 GHz are observed between the ferromagnetic resonance of the nanowires and the in-plane standing spin waves of the YIG film. The coupling strength is tunable by the magnetic configuration, allowing the coherent control of magnonic devices.

Reference:
[1] J. Chen, C. Liu, T. Liu, Y. Xiao, K. Xia, G. E. W. Bauer, M. Wu and H. Yu, Phys. Rev. Lett., 120, 217202 (2018)