![]() The exception is with common mode inductors, where the threshold of choice is at 70 MHz. NiZn ferrites exhibit higher resistivity than MnZn, and are therefore more suitable for frequencies above 1 MHz.įor applications below 5 MHz, MnZn ferrites are used above that, NiZn is the usual choice. Nickel-zinc ferrite ( NiZn, with the formula Ni aZn (1−a)Fe 2O 4).MnZn have higher permeability and saturation levels than NiZn. Manganese-zinc ferrite ( MnZn, with the formula Mn aZn (1−a)Fe 2O 4).The low coercivity means the material's magnetization can easily reverse direction while dissipating very little energy ( hysteresis losses), at the same time the material's high resistivity prevents eddy currents in the core, another source of energy loss. They have a low coercivity and are called " soft ferrites" to distinguish them from " hard ferrites", which have a high coercivity and are used to make ferrite magnets. ![]() Ferrites that are used in transformer or electromagnetic cores contain iron oxides combined with nickel, zinc, and/or manganese compounds. Ferrites are ceramic compounds of the transition metals with oxygen, which are ferrimagnetic but nonconductive.
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