Observation of magnon–magnon coupling with high cooperativity in Ni <sub>80</sub> Fe <sub>20</sub> cross-shaped nanoring array
Kartik Adhikari, Samiran Choudhury, Saswati Barman, Y. Otani, Anjan Barman
Abstract
Abstract We report here an experimental observation of dynamic dipolar coupling induced magnon–magnon coupling and spin wave (SW) mode splitting in Ni 80 Fe 20 cross-shaped nanoring array. Remarkably, we observe an anticrossing feature with minimum frequency gap of 0.96 GHz and the corresponding high cooperativity value of 2.25. Interestingly, splitting of the highest frequency SW mode occurs due to the anisotropic dipolar interactions between the cross nanorings. Furthermore, using micromagnetic simulations we demonstrate that the coupled SW modes propagate longer as opposed to other modes present in this system. Our work paves the way towards integrated hybrid systems-based quantum magnonics and on-chip coherent information transfer.