A two-dimensional array of magnetostrictive nanomagnets was used to demonstrate strong coupling between two different magnons (kM1′ and kM1′′) mediated by a phonon (kph). The coupling is strong, leading to the formation of a new quasi-particle – binary magnon-polaron. These two different magnons show 180° phase difference which is reminiscent of dark magnon modes. We show that it is possible to engineer this magnon-phonon coupling by choosing the frequency and wavelength of the acoustic wave to match the frequency and wavelength of the spin wave, the latter being controlled by a magnetic field.
- Sudip Majumder
- J. L. Drobitch
- Anjan Barman
