Abstract
Co-Zn-Ti substituted M-type barium ferrites of BaCoxTixFe12-2xO19 (x = 1−3 ) and BaCo1.1ZnyTi1.1+yFe9.8-2yO19 (y = 0−1.0) were prepared by a powder metallurgy method. Their characteristics were examined by using an X-ray diffractometer, a vibration sample magnetometer (VSM), a vector impedance analyzer, and a scanning electron microscope. When Fe ions of BaFe12O19 were replaced with Co-Ti ions, the magnetic anisotropy and coercivity decreased. As a result, the initial permeability increased to 27 for a sample with x = 1.15. Zn-Ti ions were also substituted for Fe ions in BaCo1.1Ti1.1Fe9.8O19. When the amount of substitution (y) was 0.4 in BaCo1.1ZnyTi1.1+yFe9.8-2yO19 (y = 0−1.0), the initial permeability at 10 MHz had a very high value of about 40. The reason for this may be that the coercivity becomes small as a result of the growth of the crystal particles and the decrease in the anisotropic magnetic field.
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