How do ferrite cores reduce heating losses in alternating magnetic fields?

Ferrite cores reduce heating losses in alternating magnetic fields primarily due to their high electrical resistivity.12

When a magnetic material is subjected to an alternating magnetic field, the changing flux induces eddy currents within the material. In conductive materials, these currents circulate and generate significant heat, leading to energy loss. Because ferrites are ceramic-like materials with high electrical resistance, they effectively inhibit the flow of these eddy currents, thereby minimizing energy dissipation as heat.12

Additionally, ferrites are considered "soft" magnetic materials, meaning they exhibit a low coercive force and narrow hysteresis loops. Since the energy lost as heat during the reversal of magnetization is proportional to the area of the hysteresis loop, the narrow loop characteristic of ferrites ensures that minimal energy is wasted during each cycle of the alternating field. These combined properties make ferrites highly efficient for use in high-frequency electronic equipment, such as transformers.231