1. Department of Physics and Astronomy University of Nebraska‐Lincoln Lincoln NE 68588 USA
2. NaMLab gGmbH 01187 Noethnitzer Strasse 64 a Dresden Germany
3. Ferroelectric Memory GmbH 01099 Charlotte‐Bühler‐Str. 12 Dresden Germany
4. Materials Research and Technology Department Luxembourg Institute of Science and Technology 41 Rue du Brill Belvaux L‐4422 Luxembourg
5. School of Materials and Chemical Technology Tokyo Institute of Technology Yokohama 226‐8502 Japan
6. Department of Physics and Materials Science University of Luxembourg 41 Rue du Brill Belvaux L‐4422 Luxembourg