Broadband conversion of microwaves into propagating spin waves in patterned magnetic structures

TL;DR

This study demonstrates that patterned magnetic structures can efficiently generate tunable propagating spin waves from uniform microwave excitation, advancing nanoscale magnonic device design and understanding magnetization dynamics.

Contribution

It reveals that edges of patterned magnetic samples act as efficient, tunable spin-wave sources due to local resonance enhancement, combining experimental and simulation insights.

Findings

Edges serve as efficient spin-wave sources

Local resonance is enhanced by non-uniform demagnetizing fields

Findings aid in designing nanoscale magnonic devices

Abstract

We have used time-resolved scanning Kerr microscopy (TRSKM) and micromagnetic simulations to demonstrate that, when driven by spatially uniform microwave field, the edges of patterned magnetic samples represent both efficient and highly tunable sources of propagating spin waves. The excitation is due to the local enhancement of the resonance frequency induced by the non-uniform dynamic demagnetizing field generated by precessing magnetization aligned with the edges. Our findings represent a crucial step forward in the design of nanoscale spin-wave sources for magnonic architectures, and are also highly relevant to the understanding and interpretation of magnetization dynamics driven by spatially-uniform magnetic fields in patterned magnetic samples.