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Abstract
A series of room-temperature ferromagnetic mixed oxides, Ba3Co2MnxFe24-xO41, with z-type structure, has been synthesized by high temperature solid-state reaction. Ba3Co2MnxFe24-xO41 was made from BaCO3, CoO, Mn2O3 and α-Fe2O3. The structure was determined by x-ray diffraction method; single phase with z-type structure was obtained for Ba3Co2MnxFe24-xO41(x=0, 1, 2). Frequency dependence of initial permeability of all samples was investigated. The initial permeability of Ba3Co2Mn1Fe23O41 was 13 (at 0.1 MHz), which was highest of all samples. One of the reasons is due to the change of magnetocrystalline anisotropy which caused by Mn ions and Fe ions. The other is decrease of the magnetostriction caused by Jahn-Teller effects which induced by Mn3+ ions.
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