Spin Pumping and Thermal Effects in Single-Crystalline Fe/Pt Bilayers at the Nonresonant Condition
AbstractThe voltage signal driven by a microwave at the nonresonant condition has been systematically studied in well-designed single-crystalline Fe and Fe/Pt bilayers. The voltage signals at the nonresonant condition in Fe and Fe/Pt show different angular dependence on the magnetization orientation. Through theoretical simulation and experiments of varying sample structures and field strength, it can be concluded that the voltage signal at the nonresonant condition consists of the thermal effects including the anomalous Nernst effect and the spin Seebeck effect, and the inverse spin Hall effect induced by spin pumping. Our results indicate that the microwave-induced signal at the nonresonant conditions may enable the device operation in the absence of any external magnetic field, which is beneficial for practical applications.