Magnetic Damping Modulation in IrMn3/Ni80Fe20 via the Magnetic Spin Hall Effect

Noncollinear antiferromagnets can have additional spin Hall effects due to the net chirality of their magnetic spin structure, which provides for more complex spin-transport phenomena compared to ordinary nonmagnetic materials. Here we investigated how ferromagnetic resonance of permalloy (Ni80Fe20) is modulated by spin Hall effects in adjacent epitaxial IrMn3 films. We observe a large dc modulation of the ferromagnetic resonance linewidth for currents applied along the [001] IrMn3 direction. This very strong angular dependence of spin-orbit torques from dc currents through the bilayers can be explained by the magnetic spin Hall effect where IrMn3 provides novel pathways for modulating magnetization dynamics electrically.