Journal Article BiFeO3 antiferromagnet antiferromagnets current-induced magnetization self-switching dipolar texture domain structure ferroelectric ferroelectric vortices ferroelectric thin films in‐plane ferroelectrics low symmetry magnetoelectric coupling magnonics multiferroic materials multiferroics multistate polar magnet room temperature scanning probe microscopy spin Hall effect spin torques spin-orbit torque thin films thin‐film superlattices topology van der Waals materials vortex states vortices weak ferromagnetism