1. Adolphe Merkle Institute, University of Fribourg, Chemin des Verdiers 4, 1700 Fribourg, Switzerland
2. Laboratory for Nanoelectronics and Spintronics, Research Institute of Electrical Communication, Tohoku University, 2-1-1 Katahira,
Aoba-ku, Sendai 980-8577, Japan
3. WPI Advanced Institute for Materials Research, Tohoku University, 2-1-1 Katahira,
Aoba-ku, Sendai 980-8577, Japan
4. Center for Science and Innovation in Spintronics, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan
5. Center for Innovative Integrated Electronic Systems, Tohoku University, 468-1 Aramaki Aza Aoba, Aoba-ku, Sendai 980-0845, Japan
6. Inamori Research Institute for Science, Kyoto 600-8411, Japan
7. Department of Materials Science and Engineering, Cornell University, 214 Bard Hall, Ithaca, New York 14853-1501, United States
8. Swiss National Center of Competence in Research (NCCR) Bio-Inspired Materials, University of Fribourg, Chemin des Verdiers 4, 1700 Fribourg, Switzerland
9. Department of Chemistry and Physics of Materials, University of Salzburg, Jakob-Haringer-Str. 2a, Salzburg 5020, Austria