2019/09/27 by Haoran Ni, Ni, Haoran, Shuangfeng Li +11
Materials Science · Physics and Astronomy · #Boron and Carbon Nanomaterials Research #Copper Interconnects and Reliability #FOS: Physical sciences #Magnetic properties of thin films #Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
paper · pdf · doi:10.48550/arxiv.1909.12811
openalex publication_date 2019/09/27 · openalex created_date 2020/05/29 · openalex updated_date 2026/07/28
In this paper, we report the observation of spin-orbit magnetoresistance (SOMR) in ferromagnetic metal/heavy metal/MgO system. We measure the magnetoresistance as the function of the thickness of heavy metal (HM) for CoFeB/HM/MgO and CoFeB/HM films where HM = Pt and Ta. Besides the conventional spin Hall magnetoresistance (SMR) peak, the evidence of the SOMR is indicated by another peak of the MR ratio when the thickness of HM is around 1 ~ 2 nm for CoFeB/HM/MgO films, which is absent for CoFeB/HM films. We speculate the SOMR observed in our experiment originates from the spin-orbit coupling at the HM/MgO interface. We give the boundary conditions of our samples and calculate the theoretical magnetoresistance based on spin diffusion equation. Based on the theoretical results, we can explain the two peaks we observe separately comes from the spin current generated by spin Hall effect and by Edelstein effect.