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A large unidirectional magnetoresistance (UMR) ratio of UMR/$R_{xx}\sim$$0.36\%$ is found in W/CoFeB metallic bilayer heterostructures at roomtemperature. Three different regimes in terms of the current dependence of UMRratio are identified: A spin-dependent-scattering mechanism regime at smallcurrent densities $J \sim$ $10$$^{9}$A/m$^{2}$ (UMR ratio $\propto$ $J$), aspin-magnon-interaction mechanism regime at intermediate $J \sim$$10$$^{10}$A/m$^{2}$ (UMR ratio $\propto$ $J$$^{3}$), and a spin-transfertorque (STT) regime at $J \sim$ $10$$^{11}$A/m$^{2}$ (UMR ratio independent of$J$). We verify the direct correlation between this large UMR and the transferof spin angular momentum from the W layer to the CoFeB layer by bothfield-dependent and current-dependent UMR characterizations. Numericalsimulations further confirm that the large STT-UMR stems from the tilting ofthe magnetization affected by the spin Hall effect-induced spin-transfertorques. An alternative approach to estimate damping-like spin-torqueefficiencies from magnetic heterostructures is also proposed.

Large Unidirectional Magnetoresistance in Metallic Heterostructures in the Spin Transfer Torque Regime