Quantifying the spin-wave asymmetry in single and double rectangular Ni$_{80}$Fe$_{20}$ microstrips by TR-STXM, FMR and micromagnetic simulations

TL;DR

This study quantifies spin-wave asymmetry in rectangular Ni80Fe20 microstrips using TR-STXM, FMR, and micromagnetic simulations, revealing increased asymmetry in double microstrip configurations due to proximity effects.

Contribution

It provides a comparative analysis of spin-wave asymmetry in single and double microstrips, combining experimental measurements with simulations to understand their interaction effects.

Findings

Higher asymmetry observed in double microstrips

TR-STXM and simulations show consistent results

Proximity of microstrips influences spin-wave behavior

Abstract

The asymmetry of spin-wave patterns in confined rectangular Ni$_{80}$Fe$_{20}$ microstrips, both in single and double-strip geometries, is quantified. The results of TR-STXM and micromagnetic simulations are compared. For the TR-STXM measurements and the corresponding simulations the excitation was a uniform microwave field with a fixed frequency of 9.43 GHz, while the external static magnetic field was swept. In the easy axis orientation of the analyzed microstrip, the results show a higher asymmetry for the double microstrip design, indicating an influence of the additional microstrip placed in close proximity to the analyzed one.