Spin pumping by parametrically excited exchange magnons

TL;DR

This paper demonstrates that exchange magnons with nano-scale wavelengths can be detected via spin pumping and inverse spin-Hall effect, advancing magnon-based information processing.

Contribution

It introduces a method to detect sub-micrometer exchange magnons using spin pumping combined with iSHE, revealing their role in spin transfer efficiency.

Findings

Exchange magnons can be detected using spin pumping and iSHE.

Magnon density, wavelength, and localization affect spin pumping efficiency.

This work enables magnon-based information processing at nano-scale wavelengths.

Abstract

We experimentally show that exchange magnons can be detected using a combination of spin pumping and inverse spin-Hall effect (iSHE) proving its wavelength integrating capability down to the sub-micrometer scale. The magnons were injected in a ferrimagnetic yttrium iron garnet film by parametric pumping and the iSHE-induced voltage was detected in an attached Pt layer. The role of the density, wavelength, and spatial localization of the magnons for the spin pumping efficiency is revealed. This study opens the field of the magnon-based information processing to magnons with nano-scale wavelengths.