The decrease of initial permeability(p,) with increasing frequency is enhanced by CuO addition to MgZn femte. The gradual deterioration of p,with frequency is due to a relaxation phenomenon By measuring the temperature dependence oftan 6 , the activation energy of the relaxation was calculated as approximately 0.43eV. From the results of time disaccommodation, the change in permeability for MgCuZn femte was found to be larger than that of MgZn ferrite. Futhermore, the deterioration of px with time for both ferrites continued for more than 500 hours. A ". &l. [7] K. Ohta, J. Phys. Soc. Japan, 16 (1%1) 250. Photo. 2 TEM image of MgCuZn ferrite.

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