Next-generation spintronic applications require material properties that can be hardly met by one material candidate. Here we demonstrate that by combining insulating and metallic magnets, enhanced spin-charge conversion and energy-efficient thermal spin currents can be realized. We develop a nanowire device consisting of an yttrium iron garnet and permalloy bi-layer. An interfacial temperature gradient drives the nanowire magnetization into auto-oscillations at gigahertz frequencies. Interfacial spin coupling and magnetoresistance of the permalloy layer translate spin dynamics into sizable microwave signals. The results show prospect for energy-efficient spintronic devices and present an experimental realization of magnon condensation in a heterogeneous magnetic system.
@article{arxiv.1909.12445,
title = {Thermally driven two-magnet nano-oscillator with large spin-charge conversion},
author = {Bassim Arkook and Christopher Safranski and Rodolfo Rodriguez and Ilya N. Krivorotov and Tobias Schneider and Kilian Lenz and Jürgen Lindner and Houchen Chang and Mingzhong Wu and Yaroslav Tserkovnyak and Igor Barsukov},
journal= {arXiv preprint arXiv:1909.12445},
year = {2019}
}