Spin pumping by parametrically excited exchange magnons

Sandweg, C. W.*; 梶原 瑛祐*; Chumak, A. V.*; Serga, A. A.*; Vasyuchka, V. I.*; Jungfleisch, M. B.*; 齊藤 英治; Hillebrands, B.*

Physical Review Letters, 106(21), p.216601_1 - 216601_4, 2011/05

https://doi.org/10.1103/PhysRevLett.106.216601

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.