Spin pumping by parametrically excited exchange magnons

Sandweg, C. W.*; Kajiwara, Yosuke*; Chumak, A. V.*; Serga, A. A.*; Vasyuchka, V. I.*; Jungfleisch, M. B.*; Saito, Eiji; Hillebrands, B.*

We experimentally show that exchange magnons can be detected by using a combination of spin pumping and the inverse spin-Hall effect proving its wavelength integrating capability down to the submicrometer scale. The magnons were injected in a ferrite yttrium iron garnet film by parametric pumping and the inverse spin-Hall effect 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.