1. Univ. Grenoble Alpes; Inst. NEEL; F-38042 Grenoble France
2. CNRS, Inst. NEEL; F-38042 Grenoble France
3. National Institute for Materials Science; 1-2-1 Sengen Tsukuba 305-0047 Japan
4. Technische Universität Darmstadt; Department of Materials Science; D-64287 Darmstadt Germany
5. Center for Integrated Sensor Systems; Danube University Krems; 2700 Wiener Neustadt Austria
6. Instituto de Fisica, Universidade Federal do Rio de Janeiro; Rio de Janeiro RJ Brazil