Asymmetry in effective fields of spin-orbit torques in Pt/Co/Pt stacks

Abstract

Measurements of switching via spin-orbit coupling (SOC) mechanisms are discussed for a pair of inverted Pt/Co/Pt stacks with asymmetrical Pt thicknesses. Taking into account the planar Hall effect contribution, effective fields of spin-orbit torques (SOT) are evaluated using lock-in measurements of the first and second harmonics of the Hall voltage. Reversing the stack structure leads to significant asymmetries in the switching behavior, including clear evidence of a nonlinear current dependence of the transverse effective field. Our results demonstrate potentially complex interplay in devices with all-metallic interfaces utilizing SOT.

References in corpus (3)

• Current-driven dynamics of chiral ferromagnetic domain walls
• Symmetry and magnitude of spin-orbit torques in ferromagnetic heterostructures
• Confinement engineering of s-d exchange interactions in GaMnAs quantum wells

Cited by in corpus (10)

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• Chiral magnetization textures stabilized by the Dzyaloshinskii-Moriya interaction during spin-orbit torque switching
• Engineering spin-orbit torque in Co/Pt multilayers with perpendicular magnetic anisotropy
• Spin-orbit torques in L1${}_0$-FePt/Pt thin films driven by electrical and thermal currents
• Self-current induced spin-orbit torque in FeMn/Pt multilayers
• Asymmetric Pt/Co/Pt structure as a platform for extracting pure spin Hall torque
• Determination of spin relaxation times in heavy metals via 2nd harmonic spin injection magnetoresistance
• Detection of field-free magnetization switching through thermoelectric effect in Ta/Pt/Co/Pt with significant spin-orbit torque and competing spin currents