Spin-wave modes and band structure of rectangular CoFeB antidot lattices

TL;DR

This paper investigates the magnonic band structure of rectangular CoFeB antidot lattices, revealing tunable band gaps and surface mode splitting, which could enable directional spin-wave filtering in magnonic devices.

Contribution

It provides the first combined numerical and experimental analysis of how antidot lattice orientation affects magnonic band gaps and surface modes in CoFeB films.

Findings

Band gaps shift by 0.9 GHz with lattice rotation.

Surface modes split by 0.6 GHz, matching predictions.

Demonstrates potential for directional spin-wave filtering.

Abstract

We present an investigation of rectangular antidot lattices in a CoFeB film. Magnonic band structures are numerically calculated, and band gaps are predicted which shift in frequency by 0.9 GHz when rotating the external field from the long to the short axis of the unit cell. We demonstrate by time-resolved experiments that magnonic dipolar surface modes are split in frequency by 0.6 GHz which agrees well with the theoretical prediction. These findings provide the basis for directional spin-wave filtering with magnonic devices.