Broad-wave-vector spin pumping of flat-band magnons
Jinlong Wang, Hanchen Wang, Jilei Chen, William Legrand, Peng Chen, Lutong Sheng, Jihao Xia, Guibin Lan, Yuelin Zhang, Rundong Yuan, Jing Dong, Xiufeng Han, Jean‐Philippe Ansermet, Haiming Yu
Abstract
Spin pumping can generate spin current by driving a magnetic system into resonance, a phenomenon that can be electrically detected via the inverse spin Hall effect. However, the efficiency of spin current generation has remained limited, compared to that of spin-to-charge conversion. This work systematically demonstrates an innovative technique for electrically probing propagating spin waves and creating spin current with high efficiency, mediated by flat-band magnons excited by broad wave vectors. These findings lay a promising foundation for further experiments with propagating spin waves.