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We investigate the spin Hall effect in perpendicularly magnetizedTa/Co40Fe40B20/MgO trilayers with Ta underlayers thicker than the spindiffusion length. The crystallographic structures of the Ta layer and Ta/CoFeBinterface are examined in detail using X-ray diffraction and transmissionelectron microscopy. The thinnest Ta underlayer is amorphous, whereas forthicker Ta layers a disoriented tetragonal beta-phase appears. Effectivespin-orbit torques are calculated based on harmonic Hall voltage measurementsperformed in a temperature range between 15 and 300 K. To account for thetemperature dependence of damping-like and field-like torques, we extend thespin diffusion model by including an additional contribution from the Ta/CoFeBinterface. Based on this approach, the temperature dependence of the spin Hallangle in the Ta underlayer and at Ta/CoFeB interface are determined separately.The results indicate an almost temperature-independent spin Hall angle oftheta_SH-N = -0.2 in Ta and a strongly temperature-dependent theta_SH-I for theintermixed Ta/CoFeB interface.

Influence of intermixing at the Ta/CoFeB interface on spin Hall angle in Ta/CoFeB/MgO heterostructures