Nanomagnonic heterojunctions go nonlinear

Congratulations to Ally who published her work on reconfigurable nanomagnonic heterojunctions in Phys. Rev. Applied! This work is a collaboration with Pietro Micaletti, who visited our group, and his advisor Federico Montoncello at the University of Ferrara.

By using a nanomagnonic crystal, we investigated how to tune its band structure with an external magnetic field. The result is an analog to heterojunctions, where the band structure becomes staggered. A dynamic control of the band misalignment allowed us to produce a nonlinear magnon envelope: a soliton train. The spectrum of such a train is a frequency comb, demonstrating a nonlinear modulation of magnons by a simple field protocol.