Large unidirectional magnetoresistance in metallic heterostructures in the spin transfer torque regime
TY Chang, CL Cheng, CC Huang, CW Peng… - Physical Review B, 2021 - APS
A large unidirectional magnetoresistance (UMR) ratio of UMR/R xx≈ 0.36% is found in
W/CoFeB metallic bilayer heterostructures at room temperature. Three different regimes in
terms of the current dependence of the UMR ratio are identified: a spin-dependent-scattering
mechanism regime at small current densities J≈ 10 9 A/m 2 (UMR ratio∝ J), a spin-magnon-
interaction mechanism regime at intermediate J≈ 10 10 A/m 2 (UMR ratio∝ J 3), and a spin
transfer torque (STT) regime at J≈ 10 11 A/m 2 (UMR ratio independent of J). We verify the …
W/CoFeB metallic bilayer heterostructures at room temperature. Three different regimes in
terms of the current dependence of the UMR ratio are identified: a spin-dependent-scattering
mechanism regime at small current densities J≈ 10 9 A/m 2 (UMR ratio∝ J), a spin-magnon-
interaction mechanism regime at intermediate J≈ 10 10 A/m 2 (UMR ratio∝ J 3), and a spin
transfer torque (STT) regime at J≈ 10 11 A/m 2 (UMR ratio independent of J). We verify the …
A large unidirectional magnetoresistance (UMR) ratio of is found in W/CoFeB metallic bilayer heterostructures at room temperature. Three different regimes in terms of the current dependence of the UMR ratio are identified: a spin-dependent-scattering mechanism regime at small current densities (UMR ratio ), a spin-magnon-interaction mechanism regime at intermediate (UMR ratio ), and a spin transfer torque (STT) regime at (UMR ratio independent of J). We verify the direct correlation between this large UMR and the transfer of spin angular momentum from the W layer to the CoFeB layer by both field-dependent and current-dependent UMR characterizations. Numerical simulations further confirm that the large STT-UMR stems from the tilting of the magnetization affected by the spin Hall effect-induced STTs. An alternative approach to estimate dampinglike spin torque efficiencies from magnetic heterostructures is also proposed.
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