Platinum composition dependence of spin-orbit torque in (Fe0.8Mn0.2)1−xPtx single-layer ferromagnet

Abstract

We have investigated the effect of the Pt composition on the spin-orbit torque in a (Fe 0.8 Mn 0.2 ) 1Àx Pt x single-layer ferromagnet. We observed that while the field-like torque decreases and even reverses sign with increasing the Pt composition, the damping-like torque increases monotonically and reaches 0.99 Oe=ð10 10 A=m 2 Þ in a single-layer (Fe 0.8 Mn 0.2 ) 0.52 Pt 0.48 film. The results corroborate the anomalous Hall effect and surface spin rotation model presented previously, and the relative ratio between the damping-like and field-like torques can be qualitatively understood as the relative phase change in spin-conserving and spin-flip scattering.