Magnon currents excited by the spin Seebeck effect in ferromagnetic EuS thin films

Abstract

A magnetic insulator is an ideal platform to propagate spin information by exploiting magnon currents. However, until now, most studies have focused on Y${}_3$Fe${}_5$O${}_{12}$ (YIG) and a few other ferri- and antiferromagnetic insulators, but not on pure ferromagnets. In this study, we demonstrate for the first time that magnon currents can propagate in ferromagnetic insulating thin films of EuS. By performing both local and non-local transport measurements in 18-nm-thick films of EuS using Pt electrodes, we detect magnon currents arising from thermal generation by the spin Seebeck effect. By comparing the dependence of the local and non-local signals with the temperature (< 30 K) and magnetic field (< 9 T), we confirm the magnon transport origin of the non-local signal. Finally, we extract the magnon diffusion length in the EuS film (~140 nm), a short value in good correspondence with the large Gilbert damping measured in the same film.

arXiv comment17 pages, 5 figures, and Supplemental Material

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Cited by in corpus (4)

• Electrical control of magnetism by electric field and current-induced torques
• Superconductor-ferromagnet hybrids for non-reciprocal electronics and detectors
• Magnon dispersion and spin transport in CrCl${}_3$ bilayers under different strain-induced magnetic states
• Unconventional magnon transport in antiferromagnet NiPS${}_3$ induced by an anisotropic spin-flop transition