(color online) Experimental geometry used to detect the polarity of 180° antiferromagnetic domains. The AF easy axis is oriented along the Hall bar. The staggered effective field due to an applied current results in a transient rotation of the spin axis, in a direction that depends on the relative orientations of the sublattice magnetization and the current. The two rotation directions result in opposite signs of the transverse resistance , detected using 2nd harmonic lock-in methods.^[8]