Enhancement of the spin pumping efficiency by spin-wave mode selection

TL;DR

This paper demonstrates that lateral standing surface spin waves in YIG/Pt structures significantly enhance spin pumping efficiency, offering a promising approach for developing more effective spin-current injectors.

Contribution

It reveals that higher-mode surface spin waves outperform volume modes in spin pumping efficiency, providing a new method for optimizing spin-current generation.

Findings

Surface spin waves have higher spin pumping efficiency than volume modes.

Higher-mode surface spin waves enable more effective spin-current injection.

The study suggests potential for improved spintronic device performance.

Abstract

The spin pumping efficiency of lateral standing spin wave modes in a rectangular YIG/Pt sample has been investigated by means of the inverse spin-Hall effect (ISHE). The standing spin waves drive spin pumping, the generation of spin currents from magnetization precession, into the Pt layer which is converted into a detectable voltage due to the ISHE. We discovered that the spin pumping efficiency is significantly higher for lateral standing surface spin waves rather than for volume spin wave modes. The results suggest that the use of higher-mode surface spin waves allows for the fabrication of an efficient spin-current injector.