Magnon flatband effect in antiferromagnetically coupled magnonic crystals

The dispersion relationships in antiferromagnetically coupled magnonic crystals (MCs) were investigated using micromagnetic simulations. In contrast to traditional MCs, antiferromagnetically coupled MCs have two oppositely polarized modes, enabling the realization of synthetic ferrimagnetic and synthetic antiferromagnetic MCs. The magnon flatband effect was discovered, and a large bandgap of the dispersion relation was also realized in this structure. We found that the center frequency and width of the dispersion bands with a specific polarization were influenced by the thickness and thickness ratio of the spin-up and spin-down magnetic sublattices. Based on these results, spin-wave filtering devices were proposed. Our study uncovered the magnon dispersion relations of a type of MC, which provides fresh insights into the development of ultra-efficient magnonic devices.

Automated summary

The dispersion relationships in antiferromagnetically coupled magnonic crystals (MCs) were investigated using micromagnetic simulations. Unlike traditional MCs, antiferromagnetically coupled MCs have two oppositely polarized modes, allowing the realization of synthetic ferrimagnetic and synthetic antiferromagnetic MCs. The study discovered the magnon flatband effect and achieved a large bandgap in the dispersion relation. The study also proposed spin-wave filtering devices based on the influence of thickness and thickness ratio on the dispersion bands' center frequency and width. The research provides fresh insights into the development of ultra-efficient magnonic devices.