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Antiferromagnets and compensated ferrimagnets offer opportunities toinvestigate spin dynamics in the 'terahertz gap' because their resonance modeslie in the 0.3 THz to 3 THz range. Despite some inherent advantages whencompared to ferromagnets, these materials have not been extensively studied dueto difficulties in exciting and detecting the high-frequency spin dynamics,especially in thin films. Here we show that spin-obit torque in a single layerof the highly spin-polarized compensated ferrimagnet Mn2RuxGa is remarkablyefficient at generating spin-orbit fields \mu_0H_eff, which approach 0.1x10-10T m2/A in the low-current density limit -- almost a thousand times the Oerstedfield, and one to two orders of magnitude greater than the effective fields inheavy metal/ferromagnet bilayers. From an analysis of the harmonic Hall effectwhich takes account of the thermal contributions from the anomalous Nernsteffect, we show that the antidamping component of the spin-orbit torque issufficient to sustain self-oscillation. Our study demonstrates that spinelectronics has the potential to underpin energy-frugal, chip-based solutionsto the problem of ultra high-speed information transfer.

Giant spin-orbit torque in a single ferrimagnetic metal layer