1. Peter Grünberg Institute, Forschungszentrum Jülich, D-52425 Jülich, Germany
2. Jülich-Aachen Research Alliance, JARA, Fundamentals of Future Information Technology, D-52425 Jülich, Germany
3. Faculty of Electronics, Wroclaw University of Technology, Wybrzeze Wyspianskiego 27, 50-370 Wroclaw, Poland
4. Institute of Electrical Engineering, Slovak Academy of Sciences, SK-84104 Bratislava, Slovak Republic
5. Institute of Electronics and Photonics, Slovak University of Technology, SK-81219 Bratislava, Slovakia
6. Université du Luxembourg - Faculté des Sciences, de la Technologie et de la Communication, Luxembourg, L-1359 Luxembourg
7. Department of Inorganic Chemistry, Institute of Chemical Technology, Technická 5, Prague 6, Czech Republic