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Some magnetic properties of Cu-Ge ferrite in low magnetic field

S.A.Mazen, N.I.Abu-Elsaad

Some magnetic properties such as B-H loops and initial permeability ìi for the polycrystalline soft ferrite, Cu1+xGex Fe2-2xO4;with x=0.0, 0.05, 0.1, 0.15, 0.2, 0.25 and 0.3 have been studied. The B-H loopswere firstmeasured at RT as a function of magnetizing current I from 0.5 to 6A (i.e. H=185Am-1 to 3250Am-1). Itwas found that the coercive force HC increaseswith increasing the magnetizing current but the relativemagnetizationmR shows amaximum value for each composition at I between 2-3A. Also, The B-H loops were measured at elevated temperature and constantmagnetizing current (I=2.5A which is equivalent to 900Am-1). It was observed that HC decreases with increasing the temperature. The initial permeability µi was measured as a function of temperature for the above investigated ferrite.Utilizing the initial permeability data, the Curie temperature TC and the paramagnetic temperature TP were estimated. These values of temperature (TC& TP) have been found to decrease with increasing Ge4+ ions content.