1. Peter Grünberg Institute (PGI‐7) and JARA‐FIT Forschungszentrum Jülich GmbH 52425 Jülich Germany
2. Faculty 1 ‐ Mathematics Computer Science and Natural Science RWTH Aachen University 52062 Aachen Germany
3. Advanced Thin Film Technology Division Institute of Materials Science TU Darmstadt 64287 Darmstadt Germany
4. Institute of Materials in Electrical Engineering and Information Technology (IWE 2) RWTH Aachen University 52056 Aachen Germany