1. Laboratory of Nanoscale Magnetic Materials and Magnonics, Institute of Materials (IMX), École Polytechnique Fédérale de Lausanne (EPFL), 1015 Lausanne, Switzerland
2. Max-Planck-Institute for Intelligent Systems, D-70569 Stuttgart, Germany
3. Helmholtz-Zentrum Berlin für Materialien und Energie, D-14109 Berlin, Germany
4. Institute of Microengineering (IMT), École Polytechnique Fédérale de Lausanne (EPFL), 1015 Lausanne, Switzerland