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In this paper, we report the observation of spin-orbit magnetoresistance(SOMR) in ferromagnetic metal/heavy metal/MgO system. We measure themagnetoresistance as the function of the thickness of heavy metal (HM) forCoFeB/HM/MgO and CoFeB/HM films where HM = Pt and Ta. Besides the conventionalspin Hall magnetoresistance (SMR) peak, the evidence of the SOMR is indicatedby another peak of the MR ratio when the thickness of HM is around 1 ~ 2 nm forCoFeB/HM/MgO films, which is absent for CoFeB/HM films. We speculate the SOMRobserved in our experiment originates from the spin-orbit coupling at theHM/MgO interface. We give the boundary conditions of our samples and calculatethe theoretical magnetoresistance based on spin diffusion equation. Based onthe theoretical results, we can explain the two peaks we observe separatelycomes from the spin current generated by spin Hall effect and by Edelsteineffect.

Observation of spin-orbit magnetoresistance in CoFeB/heavy metal/MgO with existence of both spin Hall effect and Edelstein effect