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Polycrystalline NiZn ferrite doped with a small amount of Y 3+ ions and having the composition of Ni0.42Zn0.58YxFe2−xO4, where x = 0.00, 0.01, 0.02, 0.04, 0.06, 0.08 and 0.10, was analyzed. Specimens were prepared by the ceramic method. Thermo-magnetic analysis and evaluation of hysteresis loops parameters were chosen as main examination methods in this study. Various parameters, such as Curie temperature TC , coercive eld Hc, remanent magnetic ux density Br, hysteresis loop area and amplitude/initial permeability were studied at low frequencies.

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