Micromagnetic simulations with periodic strayfield calculation of soft magnetic composite-materials

This work provides a complete numeric framework, with which soft magnetic composite-materials can be numerically analyzed through a combination of two distinct numerical methods. Key soft magnetic properties connected to energy efficiency, namely the permeability and the energy-loss can be predicted. The latter consists of different contributions. These contributions are treated separately in our work and therefore 2 decoupled numerical models are required to fully encompass these materials. Experimentally established concepts with the aim to improve magnetic properties for soft magnetic materials have been simulated, resulting in trends that agree well with the experimentally measured improvements. Moreover, we analyze the distinct loss contributions—an uncommon practice in experimental physics—providing valuable insights into the working principles of these materials, and therefore understanding which contributions become dominant under which conditions. Furthermore measurements of iron powders were conducted, in order to compare the numerical simulations with experimental data.