Influence of MgTiO3 on the magnetic and dielectric properties of Ba3Co2Fe24O41 hexaferrite

Abstract

MgTiO 3 -doped Ba3Co2Fe24O41 hexaferrites (Co2Z) have been prepared by the solid-state reaction method, and the magnetic and dielectric properties have been investigated. Permeability measurements indicate that MgTiO3 doping significantly improves the frequency characteristics of permeability, i.e., with the increase of MgTiO3 doping content from 0 to 5 wt %, the cutoff frequency increases greatly from 0.33 GHz to >1.8 GHz. Although μ′ decreases from 16.1 to 5.4 in a sample doped with 5 wt % MgTiO3, magnetic loss μ″ is effectively suppressed in frequency above 300 MHz. The permittivity of 5 wt % MgTiO3 doped specimen keeps stable in the value of about 17, while the dielectric loss largely decreases in the frequency rang from 300 MHz to 1.8 GHz. The low magnetic and dielectric loss and the improvement of frequency characteristics are crucial for high-frequency antenna applications of Z-type hexaferrites.

Introduction of NiZn-Ferrite Into Co$_{2}$Z-Ferrite and Effects on the Magnetic and Dielectric Properties

“…Thus, magneto-dielectric Co Z-type hexagonal ferrite (Ba Co Fe O ) with very high cut-off frequency has attracted great attention and been widely investigated [1]- [5]. In the practical high-frequency applications, high initial permeability, proper dielectric constant, low magnetic and dielectric loss are required for the Co Z ferrite.…”