Control of the Bose-Einstein Condensation of Magnons by the Spin-Hall Effect
Abstract
Previously, it has been shown that rapid cooling of yttrium-iron-garnet (YIG)/platinum (Pt) nano structures, preheated by an electric current sent through the Pt layer, leads to overpopulation of a magnon gas and to subsequent formation of a Bose-Einstein condensate (BEC) of magnons. The spin Hall effect (SHE), which creates a spin-polarized current in the Pt layer, can inject or annihilate magnons depending on the electric current and applied field orientations. Here we demonstrate that the injection or annihilation of magnons via the SHE can prevent or promote the formation of a rapid cooling induced magnon BEC. Depending on the current polarity, a change in the BEC threshold of -8% and +6% was detected. These findings demonstrate a new method to control macroscopic quantum states, paving the way for their application in spintronic devices.
Keywords
Cite
@article{arxiv.2102.13481,
title = {Control of the Bose-Einstein Condensation of Magnons by the Spin-Hall Effect},
author = {Michael Schneider and David Breitbach and Rostyslav O. Serha and Qi Wang and Alexander A. Serga and Andrei N. Slavin and Vasyl S. Tiberkevich and Björn Heinz and Bert Lägel and Thomas Brächer and Carsten Dubs and Sebastian Knauer and Oleksandr V. Dobrovolskiy and Philipp Pirro and Burkard Hillebrands and Andrii V. Chumak},
journal= {arXiv preprint arXiv:2102.13481},
year = {2023}
}