1. Nanoscale Magnetic Materials and Magnetic Domains, Institute for Materials Science, Kiel University, Kaiserstraße 2, 24143 Kiel, Germany
2. Chair of Inorganic Functional Materials, Institute for Materials Science, Kiel University, Kaiserstraße 2, 24143 Kiel, Germany
3. Chair of Microwave Engineering, Institute of Electrical and Information Engineering, Kiel University, Kaiserstraße 2, 24143 Kiel, Germany