Spin wave mode conversion in an in-plane magnetized microscale T-shaped YIG magnonic splitter

TL;DR

This study demonstrates the fabrication and experimental observation of spin wave mode conversion in a T-shaped YIG magnonic splitter, revealing mode transformation and efficiency dependence on incoming wave order.

Contribution

It introduces a fabricated T-shaped YIG magnonic splitter and experimentally analyzes spin wave mode conversion and splitting efficiency.

Findings

Spin waves split into vertical and horizontal directions at the junction.

Mode conversion occurs during the splitting process.

Splitting efficiency depends on the first order of incoming spin waves.

Abstract

As one of the fundamental magnonic devices, a magnonic splitter device has been proposed and spin wave propagation in this device has been studied numerically and experimentally. In the present work, we fabricated a T-shaped magnonic splitter with 6 $\mu$m-wide three arms using a 100 nm-thick yttrium iron garnet film and, using time-resolved magneto-optic Kerr microscopy, observed that spin waves split into both, the vertical and the horizontal direction at the junction. Analyzing the results, we found that spin wave modes are converted into another during the splitting process and the splitting efficiency is dominantly dependent on the 1st order of incoming spin waves.