The Rashba-Edelstein effect stems from the interaction between the electron's spin and its momentum induced by spin-orbit interaction at an interface or a surface. It was shown that the inverse Rashba-Edelstein effect can be used to convert a spin- into a charge current. Here, we demonstrate that a Bi/Ag Rashba interface can even drive an adjacent ferromagnet to resonance. We employ a spin-torque ferromagnetic resonance excitation/detection scheme which was developed originally for a bulk spin-orbital effect, the spin Hall effect. In our experiment, the direct Rashba-Edelstein effect generates an oscillating spin current from an alternating charge current driving the magnetization precession in a neighboring permalloy (Py, Ni80Fe20) layer. Electrical detection of the magnetization dynamics is achieved by a rectification mechanism of the time dependent multilayer resistance arising from the anisotropic magnetoresistance.
@article{arxiv.1508.01410,
title = {Interface-driven spin-torque ferromagnetic resonance by Rashba coupling at the interface between non-magnetic materials},
author = {M. B. Jungfleisch and W. Zhang and J. Sklenar and W. Jiang and J. E. Pearson and J. B. Ketterson and A. Hoffmann},
journal= {arXiv preprint arXiv:1508.01410},
year = {2016}
}