Electrical Switching of Tristate Antiferromagnetic Néel Order in α−Fe2O3 Epitaxial Films

We demonstrate nondecaying, steplike electrical switching of tristate N\'eel order in \mathrm{Pt}/\ensuremath{\alpha}\text{\ensuremath{-}}{\mathrm{Fe}}_{2}{\mathrm{O}}_{3}bilayers detected by the spin-Hall induced anomalous Hall effect. The as-grown \mathrm{Pt}/\ensuremath{\alpha}\text{\ensuremath{-}}{\mathrm{Fe}}_{2}{\mathrm{O}}_{3}bilayers exhibit sawtooth switching behavior generated by current pulses. After annealing by a high pulse...