Non-local magnon transport in the compensated ferrimagnet GdIG

Kathrin Ganzhorn; Tobias Wimmer; Joseph Barker; Gerrit E. W. Bauer; Zhiyong Qiu; Eiji Saitoh; Nynke Vlietstra; Stephan Geprägs; Rudolf Gross; Hans Huebl; Sebastian T. B. Goennenwein

arXiv · 1705.02871

Non-local magnon transport in the compensated ferrimagnet GdIG

Kathrin Ganzhorn·Tobias Wimmer·Joseph Barker·Gerrit E. W. Bauer·Zhiyong Qiu·Eiji Saitoh·Nynke Vlietstra·Stephan Geprägs·Rudolf Gross·Hans Huebl·Sebastian T. B. Goennenwein

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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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Kathrin Ganzhorn, Tobias Wimmer, Joseph Barker, Gerrit E. W. Bauer, Zhiyong Qiu, Eiji Saitoh, Nynke Vlietstra, Stephan Geprägs, Rudolf Gross, Hans Huebl, Sebastian T. B. Goennenwein. 2017-05-08. Non-local magnon transport in the compensated ferrimagnet GdIG. https://arxiv.org/abs/1705.02871

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