Interconversion of multiferroic domains and domain walls

Materials with long-range order like ferromagnetism or ferroelectricity exhibit uniform, yet differently oriented three-dimensional regions called domains that are separated by two-dimensional topological defects termed domain walls\cite{Tagantsev2010,AlexHubert1998}. A change of the ordered state across a wall can lead to local non-bulk properties such as enhanced conductance promotion unusual phases\cite{Seidel2009,Meier2012,Farokhipoor2014}. Although highly desirable, controlled transfer these exciting between bulk and walls is usually not possible. Here we demonstrate this crossover from three- two-dimensions for confining multiferroic Dy$_{0.7}$Tb$_{0.3}$FeO$_3$ into at specified location within non-multiferroic environment. This process fully reversible; an applied magnetic electric field controls transformation. Aside aspect magnetoelectric functionality, interconversion be key tailoring elusive architectures in antiferromagnets.