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Recent studies evidence the emergence of asymmetric electron transport inlayered conductors owing to the interplay between electrical conductivity,magnetization, and the spin Hall or Rashba- Edelstein effects. Here, weinvestigate the unidirectional magnetoresistance (UMR) caused by thecurrent-induced spin accumulation in Co/Pt and CoCr/Pt bilayers. We identifythree competing mechanisms underpinning the resistance asymmetry, namelyinterface and bulk spin-dependent electron scattering and electron-magnonscattering. Our measurements provide a consistent description of the current,magnetic field, and temperature dependence of the UMR and show that bothpositive and negative UMR can be obtained by tuning the interface and bulkspin-dependent scattering terms relative to the magnon population.

Origins of the unidirectional spin Hall magnetoresistance in metallic bilayers