Magnetic cores used in common mode chokes (CMCs) are essential components in electromagnetic compatibility (EMC) engineering. They are widely applied to suppress unwanted electromagnetic emissions in power electronics, communication systems, and high-speed digital devices. Their performance relies on the frequency-dependent and nonlinear magnetic response of the core material, which must effectively attenuate common-mode noise while operating under varying electrical and magnetic conditions. As switching frequencies and power densities continue to increase, a deeper understanding of magnetic saturation and dynamic magnetization processes in these materials becomes increasingly important.

The aim of this doctoral project is to investigate the physical mechanisms governing nonlinear magnetization dynamics and magnetic saturation in magnetic core materials, including ferrites and nanocrystalline alloys, used in common mode chokes. Particular attention will be devoted to connecting the microscopic magnetic properties of these materials with the macroscopic EMC performance of CMC devices.

The project builds on the candidate’s previous experience in EMC measurements and characterization of common mode chokes, including methods based on CISPR-17 and practical EMC engineering approaches. This application-oriented knowledge will serve as a foundation for a deeper investigation of the physical processes that determine the frequency-dependent impedance and suppression behavior of magnetic cores.

To extend the work toward fundamental physics, the research will incorporate magnetic resonance spectroscopy techniques, such as ferromagnetic resonance, in order to probe magnetization dynamics and determine intrinsic parameters including anisotropy, damping, and spin relaxation processes. These measurements will provide insight into the mechanisms that lead to nonlinear behavior and saturation in magnetic materials.

The experimental studies will be complemented by analytical considerations and numerical modeling aimed at linking microscopic spin dynamics and material parameters to the observable behavior of common mode choke components.

The ultimate goal of the project is to establish a deeper physical understanding of magnetic core behavior in EMC components, while developing improved characterization and interpretation methods relevant for high-frequency electronic systems.