We report the experimental observation of large spin pumping signals in YIG/Pt system driven by broad-wavevector spin-wave spin current. 280 nm-wide microwave inductive antennas offer broad-wavevector excitation which, in combination with quasi-flatband of YIG, allows a large number of magnons to participate in spin pumping at a given frequency. Through comparison with ferromagnetic resonance spin pumping, we attribute the enhancement of the spin current to the multichromatic magnons. The high efficiency of spin current generation enables us to uncover nontrivial propagating properties in ultra-low power regions. Additionally, our study achieves the spatially separated detection of magnons, allowing the direct extraction of the decay length. The synergistic combination of the capability of broad-wavevector excitation, enhanced voltage signals, and nonlocal detection provides a new avenue for the electrical exploration of spin waves dynamics.
@article{arxiv.2311.09098,
title = {Broad-Wavevector Spin Pumping of Flat-Band Magnons},
author = {Jinlong Wang and Hanchen Wang and Jilei Chen and William Legrand and Peng Chen and Lutong Sheng and Jihao Xia and Guibin Lan and Yuelin Zhang and Rundong Yuan and Jing Dong and Xiufeng Han and Jean-Philippe Ansermet and Haiming Yu},
journal= {arXiv preprint arXiv:2311.09098},
year = {2023}
}