The soft ferrite magnets

Ferrites magnets are normally derived from metal oxides that include hematite (Fe2O3) or magnetite (Fe3O4) in inclusion to oxides of other metals. Ferrites are, like most other ceramics, difficult and brittle. In conditions of the magnetic properties, the totally different ferrites are generally classified as "soft" or "hard", which refers to their minimal or substantial magnetic coercivity.

Ferrites magnets which are applied in transformer or electromagnetic cores comprise nickel, zinc, or manganese compounds. They possess a minimal coercivity and so are named gentle ferrites. The minimal coercivity indicates the material's magnetization can very easily reverse path with out dissipating a great deal power (hysteresis losses), although the material's substantial resistivity prevents eddy currents inside core, one more resource of power loss.

Because of the comparatively minimal losses at substantial frequencies, they are extensively applied inside cores of RF transformers and inductors in programs that include switched-mode energy supplies.

Manganese-zinc ferrite (MnZn, with the formula MnaZn(1-a)Fe2O4). MnZn have higherpermeability and saturation induction than NiZn.
Nickel-zinc ferrite (NiZn, with the formula NiaZn(1-a)Fe2O4). NiZn ferrites exhibit higher resistivity than MnZn, and are therefore more suitable for frequencies above 1 MHz.

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