1. Experimental Physics V Center for Electronic Correlations and Magnetism Institute of Physics University of Augsburg D-86135 Augsburg Germany
2. Chirality Research Center Hiroshima University Higashi-Hiroshima Hiroshima 739-8526 Japan
3. 1. Physikalisches Institut Universität Stuttgart Pfaffenwaldring 57 70569 Stuttgart Germany
4. Physik Department E10 Technische Universität München 85748 Garching Germany
5. Laboratory of Nanoscale Magnetic Materials and Magnonics Institute of Materials (IMX) École Polytechnique Fédérale de Lausanne (EPFL) 1015 Lausanne Switzerland