1. Institute of Circuits and Systems, TU Dresden,Dresden,Germany
2. Peter Grünberg Institut 7 (PGI-7), Forschungszentrum Jülich GmbH,Jülich,Germany
3. Peter Grünberg Institut 7 (PGI-10), Forschungszentrum Jülich GmbH,Jülich,Germany
4. Aristotle University of Thessaloniki,Department of Physics,Thessaloniki,Greece
5. University of California Berkeley,Department of Electrical Engineering and Computer Sciences,Berkeley,California,US