1. Institute of Materials Science, Technical University of Darmstadt 1 , Darmstadt 64287, Germany
2. Faculty of Physics and Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen 2 , D-47048 Duisburg, Germany
3. European Synchrotron Radiation Facility 3 , Grenoble F-38043, France
4. Key Laboratory of Magnetic Materials and Devices, Ningbo Institute of Material Technology and Engineering 4 , Ningbo 315201, China
5. School of Materials Science and Engineering, Shanghai University 5 , Shanghai 200444, China