Secondary Excitation of Spin-Waves: How Electromagnetic Cross-Talk Impacts on Magnonic Devices

TL;DR

This paper investigates electromagnetic cross-talk effects in magnonic devices, revealing how secondary spin-wave excitations influence device performance and providing methods for estimation and visualization.

Contribution

It introduces a detailed analysis of electromagnetic cross-talk in magnonic devices, including a rule of thumb estimation and visualization techniques for secondary spin-wave excitation.

Findings

Electrical spectroscopy measurements reveal signal contributions from cross-talk.

A practical estimation method for secondary SW excitation is developed.

Time-resolved MOKE imaging visualizes secondary SW excitation.

Abstract

This work examines the impact of electromagnetic cross-talk in magnonic devices when using inductive spin-wave (SW) transducers. We present detailed electrical SW spectroscopy measurements showing the signal contributions to be considered in magnonic device design. We further provide a rule of thumb estimation for the cross-talk that is responsible for the secondary SW excitation at the output transducer. Simulations and calibrated electrical characterizations underpin this method. Additionally, we visualize the secondary SW excitation via time-resolved MOKE imaging in the forward-volume configuration in a 100nm Yttrium-Iron-Garnet (YIG) system. Our work is a step towards fast yet robust joint electromagentic-micromagnetic magnonic device design.