  We probe the current-induced magnetic switching of insulating
antiferromagnet/heavy metals systems, by electrical spin Hall magnetoresistance
measurements and direct imaging, identifying a reversal occurring by domain
wall (DW) motion. We observe switching of more than one third of the
antiferromagnetic domains by the application of current pulses. Our data reveal
two different magnetic switching mechanisms leading together to an efficient
switching, namely the spin-current induced effective magnetic anisotropy
variation and the action of the spin torque on the DWs.
