Multiferroic behavior confined by symmetry in EuTiO3 films

1Advanced Photon Source, Argonne National Laboratory, Argonne, IL 60439, USA 2National Institute of Standards and Technology, Gaithersburg, MD 20899, USA 3Materials Science Division, Argonne National Laboratory, Argonne, IL 60439, USA 4Department of Materials Science and Engineering Cornell University, Ithaca, NY 14853, USA 5Kavli Institute at Cornell for Nanoscale Science, Ithaca, NY 14853, USA 6Department of Chemical Engineering and Materials Science, 421 Washington Ave., SE, Minneapolis, MN 55455-0132, USA 7University of Liverpool, Dept. of Physics, Liverpool, L69 3BX, United Kingdom 8Instituto Regional de Investigación Científica Aplicada (IRICA) and Departamento de Física Aplicada, Universidad de Castilla-La Mancha, 13071 Ciudad Real, Spain 9School of Physical Sciences, Dublin City University, Dublin 9, Ireland.