What is a magnetic core

Magnetic core refers to a sintered magnetic metal oxide composed of various iron oxide mixtures. For example, manganese-zinc ferrite and nickel-zinc ferrite are typical magnetic core materials. Manganese-zinc ferrites are characterized by high permeability and high flux density, and at frequencies below 1MHz, they have low loss characteristics. Nickel-zinc ferrite has the characteristics of extremely high resistivity, low magnetic permeability of less than a few hundred, and low loss at frequencies higher than 1MHz. Ferrite cores are used in coils and transformers of various electronic devices.