Design of Bicomponent Magnonic Waveguide With High Group Velocity for Signal Transmission Devices

Dipole-exchange spin waves (SWs) propagation in the air gap and bicomponent magnonic waveguides (BMWs) encompassed with alternating SM and N stripes based on different saturation magnetization (M
_s
) is studied through micromagnetic simulation. The air gaps MWs (AMWs) exhibit the transmission bands in the range ≈3-10 GHz as a result of inhomogeneous demagnetization field around the N stripes (air gaps), where the magnetostatic coupling helps to propagate the SWs in entire waveguides with low group velocity v
_g
28-380 m/s. By incorporating two different Ms, magnetic materials in both SM and N stripes form BMWs enhancing the transmission bands from narrow to the wide range which is ≈14-60 GHz due to large exchange coupling at the interfaces. It increases the intercoupling between neighboring stripes, which reduces the energy loss of SWs that can be propagated throughout the entire waveguide with large group velocity v
_g
8500-10600 m/s. The design of AMWs and BMWs would be suitable to construct an efficient signal processing device with high group velocity and wide transmission bands depending on periodicity and saturation magnetization present in the MWs.