Steffen Duhm,1,* Shunsuke Hosoumi,1 Ingo Salzmann,2 Alexander Gerlach,3 Martin Oehzelt,4 Bernhard Wedl,2,5 Tien-Lin Lee,6,† Frank Schreiber,3 Norbert Koch,2 Nobuo Ueno,1 and Satoshi Kera1 1Graduate School of Advanced Integration Science, Chiba University, 1-33 Yayoi-cho, Inage-ku, Chiba 263-8522, Japan 2Institut fur Physik, Humboldt-Universitat zu Berlin, Newtonstr. 15, D-12489 Berlin, Germany 3Institut fur Angewandte Physik, Universitat Tubingen, Auf der Morgenstelle 10, D-72076 Tubingen, Germany 4Institut fur Experimentalphysik, Johannes Kepler Universitat Linz, Altenbergerstr. 69, A-4040 Linz, Austria 5Institut fur Festkorperphysik, Technische Universitat Graz, Petersgasse 12, A-8010 Graz, Austria 6European Synchrotron Radiation Facility, BP 220, 38043 Grenoble Cedex 9, France Received 7 September 2009; revised manuscript received 4 November 2009; published 19 January 2010