Abstract
This study focuses on the structure and magnetic properties of Y-type hexagonal ferrite, especially the tunable permeability controlled by the direct current (dc) magnetic field. The composition of Ba2Zn1.2−xCoxCu0.8Fe12O22 (x varied from 0 to 1.2) is selected, where the changes in the amount of Zn and Co is to tailor the magnetic properties. The dependence of complex permeability (μ) in high frequency on the magnetic field was measured by a precision LCR meter with a bias current source. Magnetic permeability μ′ declined nonlinearly with the strengthening of a dc magnetic field generated by the bias current at a fixed test frequency. The permeability μ′ and its tunability reflect the magnetization process of ferrimagnet. And they both increase with the rise in the amount of Zn due to the decrease of magnetocrystalline anisotropy. Correlation existed between the microstructure, permeability μ′, and its tunability of the Y-type hexagonal ferrites. Increase of the permeability μ and its tunability was also observed as the sintering temperature rose, which was attributed to the increase of average grain size and decrease of porosity. The applied methods of magnetic field may also influence the permeability’s response to the external field. The ferrites’ nonlinear magnetic property provides a possibility for tunable inductive components in a wide frequency range.
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