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Tackling Complex Phenomena in Nanoscale Multiferroics

An atomistic scheme is used to study the dependence of nanodots and ultra-thin films made of the lead-free BiFeO3 (BFO) multiferroic material on electrical boundary conditions. The ground-state patterns of the electrical dipoles, oxygen octahedral tiltings and magnetic dipoles are found to dramatically depend on such electrical boundary conditions, as well as on the dimensionality of the BFO nanostructure. These unusual dependencies are of large fundamental importance, and may open the door for novel devices with unprecedented performances.