Comparison of spin-orbit torques and spin pumping across NiFe/Pt and NiFe/Cu/Pt interfaces

Abstract

We experimentally investigate spin-orbit torques and spin pumping in NiFe/Pt bilayers with direct and interrupted interfaces. The damping-like and field-like torques are simultaneously measured with spin-torque ferromagnetic resonance tuned by a dc bias current, whereas spin pumping is measured electrically through the inverse spin Hall effect using a microwave cavity. Insertion of an atomically thin Cu dusting layer at the interface reduces the damping-like torque, field-like torque, and spin pumping by nearly the same factor of ~1.4. This finding confirms that the observed spin-orbit torques predominantly arise from diffusive transport of spin current generated by the spin Hall effect. We also find that spin-current scattering at the NiFe/Pt interface contributes to additional enhancement in magnetization damping that is distinct from spin pumping.

References in corpus (9)

• Spin Transfer Torques
• Scaling behavior of the spin pumping effect in ferromagnet/platinum bilayers
• Determination of intrinsic spin Hall angle in Pt
• Interface enhancement of Gilbert damping from first-principles
• Electronic control of the spin-wave damping in a magnetic insulator
• Large voltage-induced modification of spin-orbit torques in Pt/Co/GdOx
• Rectification of radio frequency current in ferromagnetic nanowire
• Detection of the dc inverse spin Hall effect due to spin pumping in a novel meander-stripline geometry
• Quantification of the spin-Hall anti-damping torque with a resonance spectrometer

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