1. Institute of Materials, Laboratory of Nanoscale Magnetic Materials and Magnonics, Ecole Polytechnique Federale de Lausanne (EPFL), School of Engineering, 1015 Lausanne, Switzerland
2. Institute of Materials, Laboratory of Semiconductor Materials, Ecole Polytechnique Federale de Lausanne, School of Engineering, 1015 Lausanne, Switzerland
3. Institute of Physics, School of Natural Sciences, Ecole Polytechnique Federale de Lausanne, 1015 Lausanne, Switzerland
4. Institute of Electrical and Micro Engineering, School of Engineering, Ecole Polytechnique Federale de Lausanne, 1015 Lausanne, Switzerland