Fano resonance of a magnonic ring resonator with a nano-scatterer embedded in a magnonic conduit

We present micromagnetic simulation of a nanoscale magnonic ring resonator coupled to a magnonic waveguide, with and without a hole embedded in the waveguide [hole-embedded nano-ring resonator (H-NRR) and NRR, respectively], for realizing transformation into a Fano resonance frequency spectral line shape from a Lorentzian one. Transmission and reflection spectra of the H-NRR and NRR have been analyzed for different structural parameters (embedded hole diameter and gap between the ring and the waveguide) and material parameters (damping factor of the ring) to achieve maximum spectral transmission magnitude variation. The obtained micromagnetic simulation results are supported by an analytical model that consists of two-tracks of wave propagation, forwards and backwards. Our findings show that the H-NRR system demonstrates a monotonic dependence of spectral transmission magnitude variation against the aforementioned design parameters (gap and damping), which should provide better engineering controllability and tolerance when compared with the original NRR system. Overall, our proposed structure and study may help in building unconventional magnonic integrated circuits for sensing, data processing systems, and computing.