An asymmetric magnetoresistance (MR) is investigated in Py/Pt bilayers. The asymmetric MR linearly increases with current density up to a threshold, and increases more rapidly above the threshold. To reveal the origin of threshold behavior, we investigate the magnetic field dependence of the asymmetric MR. It is found that the magnetic field strongly suppresses the asymmetric MR only above the threshold current density. Micromagnetic simulation reveals that the reduction of magnetization due to the spin-torque oscillation can be the origin of the threshold behavior of asymmetric MR.
@article{arxiv.1705.10059,
title = {Origin of threshold current density for asymmetric magnetoresistance in Pt/Py bilayers},
author = {Tian Li and Sanghoon Kim and Seung-Jae Lee and Seo-Won Lee and Tomohiro Koyama and Daichi Chiba and Takahiro Moriyama and Kyung-Jin Lee and Kab-Jin Kim and Teruo Ono},
journal= {arXiv preprint arXiv:1705.10059},
year = {2017}
}