Influence of the interface quality on the estimation of thespin-to-charge conversion efficiency in spin pumping experiments on Co_2FeAl_（0.5）Si_（0.5）-Ge

摘要

In spintronics, which is expected to overcome the limitations of CMOS technology, achieving highly efficient spin injection/detection and conversion is extremely important. Spin pumping is believed to be a very efficient way to inject a spin current from a ferromagnetic (FM) layer to a non-magnetic (NM) layer using ferromagnetic resonance. However, generally, the influence of the quality of the FM/NM interface, which is thought to affect the spin injection efficiency and thus the estimation of the spin Hall angle ~ğœƒSHE, has not been intensively discussed. If the efficiency strongly depends on the interface quality, controlling the interface is indispensable to realize efficient control of a spin current with low power consumption.