  We demonstrate room temperature ferroelectricity in the epitaxial thin films
of magnetoelectric GaFeO3. Piezo-force measurements show a 180o phase shift of
piezoresponse upon switching the electric field indicating nanoscale
ferroelectricity in epitaxial thin films of gallium ferrite. Further,
temperature dependent impedance analysis with and without the presence of an
external magnetic field clearly reveals a pronounced magneto-dielectric effect
across the magnetic transition temperature. In addition, our first principles
calculations show that Fe ions are not only responsible for ferrimagnetism as
observed earlier, but also give rise to the observed ferroelectricity, making
GFO an unique single phase multiferroic.
