Bias field orientation driven reconfigurable magnonics and magnon-magnon coupling in triangular shaped Ni 80 Fe 20 nanodot arrays.

Reconfigurable magnonics has attracted intense interest due to their myriad advantages including energy efficiency, easy tunability and miniaturization of on-chip data communication and processing devices. Here, we demonstrate efficient reconfigurability of spin-wave dynamics as well as spin-wave avoided crossing by varying bias magnetic field orientation in triangular shaped Ni 80 Fe 20 nanodot arrays. Particularly, for a range of in-plane angle of bias field, we have achieved mutual coherence between two lower frequency modes leading to a drastic modification in the ferromagnetic resonance frequency. Significant modification in magnetic stray field distribution is observed at the avoided crossing regime due to anisotropic dipolar interaction between two neighbouring dots. Furthermore, using micromagnetic simulations we demonstrate that the hybrid spin wave (SW) modes propagate longer through an array as opposed to the non-interacting modes present in this system, indicating the possibility of coherent energy transfer of hybrid magnon modes. This result paves way for the development of integrated on-chip magnonic devices operating in gigahertz frequency regime.