Detection of inverse spin Hall effect in epitaxial ferromagnetic Fe3Si films with normal metals Au and Pt

Abstract

Spin pumping transfers the spin momentum of the magnetization precession to the conduction electrons and forms pure spin currents, and was investigated in the ferromagnetic epitaxial Fe3Si films and polycrystalline Py films covered with normal metal (Pt, Au) overlayers, respectively. With the applied microwave applied from a cavity and an in-plane magnetic field, an electric voltage due to inverse spin-Hall effect is detected under the ferromagnetic resonance condition. A linear relationship between the measured voltage and microwave power has been obtained, consistent with a theoretical model. The spin Hall angles of Pt and Au as deduced from the present Py and Fe3Si data are in agreement with the published values. A very large voltage signal is observed for Fe3Si/Au film with in-situ capping of Au, suggesting the possibility of the future applications for the spintronic devices.