Analysis of radio-frequency losses of ferromagnetic composite materials

The aim of this paper is to analyze the magnetic mechanisms responsible for the complex permeability and core losses of ferromagnetic composites for radio-frequency applications. We compared these composites with a Ni-Zn-Cu spinel ferrite. Core. losses were measured versus frequency (1.5-500 MHz) and induction level (0-25 mT). We show that the main contribution to permeability and core losses are rotational mechanisms.