1. Institute of Physics (IA); RWTH Aachen University; 52065 Aachen Germany
2. Peter Grünberg Institute; Forschungszentrum Juelich; 52425 Juelich Germany
3. Institute of Electronic Materials (IWE2); RWTH Aachen University; 52065 Aachen Germany
4. Central Facility for Electron Microscopy; RWTH Aachen University; 52065 Aachen Germany
5. Fraunhofer Institute for Laser Technology (ILT); Steinbachstr. 15 52074 Aachen Germany