  Spin-orbit torques are studied in Ta/TbFeCo patterned structures with a bulk
perpendicular magnetic anisotropy (bulk-PMA) for the first time. The
current-induced magnetization switching is investigated in the presence of a
perpendicular, longitudinal, or transverse field. In order to rule out Joule
heating effect, switching of the magnetization is also demonstrated using
current pulses. It is found that the anti-damping torque correlated with spin
Hall effect is very strong, and a spin Hall angle of about 0.12 is obtained.
The field-like torque related with Rashba effect is negligible in this
structure suggesting that the interface play a significant role in Rashba-like
torque.
