Spin–orbit torque in a single ferrimagnetic GdFeCo layer near the compensation temperature

We report spin–orbit torque (SOT) based on spin-torque ferromagnetic resonance (ST FMR) in a single ferrimagnetic layer. Temperature-dependent anomalous Hall resistance (Rxy) shows a magnetic compensation temperature (Tm) of about 205 K. Temperature-dependent ST FMR is performed to quantify SOT; the torque is exerted to the total moment, and the SOT sign diverges as the temperautre approaches Tm. X-ray photoelectron spectroscopy revealed that SOT arises due to the broken symmetry of the bulk spatial inversion along the normal direction of the film. Our finding provides useful information about the controlled temperature of bulk spin–orbit coupling in single layer GdFeCo.