New ferromagnetic composites for radio-frequency applications

Abstract We analysed the magnetic properties (complex permeability and core losses) of a new family of ferromagnetic composites for radio-frequency applications. We compared with high performance spinel ferrites (Ni–Zn–Cu ferrites). Core losses were measured versus frequency (1.5–500 MHz) and induction level (0–25 mT). Intrinsic core losses of these ferromagnetic materials are assessed to be less than the best ferrites from 1.5 to 500 MHz ( 3 ) at 37.5 mT MHz. It is observed that these composite materials are very promising for HF, but mostly VHF operating conditions.