Non-local magnon transport in the compensated ferrimagnet GdIG

Abstract

We study the diffusive transport of magnons through the compensated ferrimagnetic insulator Gd3Fe5O12 (GdIG). The magnons are injected and detected electrically in a non-local measurement configuration via two parallel Pt strips deposited on top of the ferrimagnet. GdIG exhibits a rich magnon spectrum, with several thermally populated magnon bands at room temperature. We observe a strong temperature and field dependence of the non-local voltage in the detector strip. Just below the magnetization compensation temperature we find that the increasing magnetic field causes an unexpected enhancement of the non-local signal. A comparison with GdIG spin wave spectra obtained from atomistic modeling indicates that the thermal magnon population is important for understanding the non-local voltage signal.

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• Absence of evidence of spin transport through amorphous Y${}_3$Fe${}_5$O${}_{12}$
• A puzzling insensitivity of magnon spin diffusion to the presence of 180${}^{\circ }$ domain walls in a ferrimagnetic insulator