title: Universal method for separating spin pumping from spin rectification voltage of ferromagnetic resonance.
abstract: We develop a method for universally resolving the important issue of separating spin pumping from spin rectification signals in bilayer spintronics devices. This method is based on the characteristic distinction of spin pumping and spin rectification, as revealed in their different angular and field symmetries. It applies generally for analyzing charge voltages in bilayers induced by the ferromagnetic resonance (FMR), independent of FMR line shape. Hence, it solves the outstanding problem that device-specific microwave properties restrict the universal quantification of the spin Hall angle in bilayer devices via FMR experiments. Furthermore, it paves the way for directly measuring the nonlinear evolution of spin current generated by spin pumping. The spin Hall angle in a Py/Pt bilayer is thereby directly measured as 0.021±0.015 up to a large precession cone angle of about 20°.
authors: Department of Physics and Astronomy, University of Manitoba, Winnipeg, Manitoba R3T 2N2, Canada.
authors: Lihui
authors: L
authors: Bai
authors: P
authors: P
authors: Hyde
authors: Y S
authors: YS
authors: Gui
authors: C-M
authors: CM
authors: Hu
authors: V
authors: V
authors: Vlaminck
authors: J E
authors: JE
authors: Pearson
authors: S D
authors: SD
authors: Bader
authors: A
authors: A
authors: Hoffmann