Spin wave wavevector up-conversion in Y-shaped Permalloy structures

Spin waves in micrometer-sized, patterned Y-shaped Permalloy structures were studied using micro-focus Brillouin light scattering (BLS) with a magnetic field applied in-plane. For in-plane magnetized thin films and microstrips, the dispersion relations depend on the angle of the magnetization with respect to the microstrip axis. BLS measurements show that spin waves generated in the two arms that form the top of the Y structure can be channeled into a longer magnetic microstrip that forms the base when the applied field is oriented perpendicular to the long axis of the base. In this configuration, the base supports surface spin waves. A comparison of the BLS data with micromagnetic simulations reveals that low-k spin waves generated by a microstrip antenna in the arms are converted to higher-k spin waves in the base, which may be useful for nanomagnonic applications. Published under an exclusive license by AIP Publishing.

Automated summary

In this study, spin waves in micrometer-sized, patterned Y-shaped Permalloy structures were investigated using micro-focus Brillouin light scattering with in-plane magnetic field applied. The research found that spin waves generated in one part of the structure can be channeled into another part, and low-k spin waves can be converted to higher-k spin waves, which may have applications in nanomagnonics.