Adv. funct. mater. Adv. funct. mater. Room-Temperature AFM Electric-Field-Induced Topotactic Transformation between Perovskite and Brownmillerite SrFeOx with Sub-Micrometer Spatial Resolution Ferreiro-Vila E. Blanco-Canosa S. Lucas del Pozo I. Universidad de Zaragoza Vasili H.B. Magén C. Universidad de Zaragoza Ibarra A. Universidad de Zaragoza Rubio-Zuazo J. Castro G.R. Morellón L. Universidad de Zaragoza Rivadulla F. 2019 research-article