Electrical manipulation of spin pumping signal through nonlocal thermal magnon transport

TL;DR

This paper demonstrates how RF microwave, thermal effects, and Oersted fields influence spin-pumping signals in nonlocal magnon transport, highlighting the potential for electrical control and the need for careful interpretation.

Contribution

It reveals the impact of microwave-induced thermal and magnetic effects on spin-pumping signals in nonlocal magnon transport, providing insights for electrical manipulation and measurement accuracy.

Findings

RF microwave affects spin-pumping signals via thermal and magnetic effects

Nonlocal magnon transport can be used to electrically detect and manipulate spin signals

Caution is needed as microwave effects can overshadow incoherent magnon signals

Abstract

We study the magnon transport in the nonlocal configuration composed of two Pt strips on top of yttrium iron garnet, with and without the presence of RF microwave generated by an on-chip antenna. We find that the spin-Hall induced thermal magnon heating/cooling, the Oersted field as well as the Joule heating generated by the a.c. current in the Pt injector can significantly influence the spin-pumping signal measured by the Pt detector in the presence of RF microwave, forcing the spin-pumping voltage to show up in the first and second harmonic signals in the nonlocal magnon transport measurement. These results indicate that nonlocal magnon transport configuration can serve as a structure to electrically detect and manipulate the spin-pumping signal. Furthermore, certain caution is needed when studying the interplay between incoherent magnon and coherent magnon spin transport in the nonlocal transport configuration, since the change in microwave-induced spin-pumping voltage can overwhelm the incoherent magnon transport signals.