Journal Article BiFeO3 Bismuth Ferric Compounds Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, Non-P.H.S. U015TT5I8H X-ray nanodiffraction X‐ray microscopy antiferromagnetic spintronics bismuth ferrite diffuse scattering domain engineering domain melting domain walls electrically readable antiferromagnetic textures electronic anisotropy ferroelastic strain coupling ferroelectrics freestanding films multiferroic domains multiferroic heterostructures multiferroics non-volatile and rewritable antiferromagnetic spin states optical control soft X‐ray ptychography strain perturbation strained Bismuth ferrite thin film synchrotron techniques ultrafast modulation