Dielectric and magnetic permeability behavior of BaCo2−xNixFe16O27 W-type hexaferrites

Temperature dependent structural and magnetic behavior of Y-type hexagonal ferrites synthesized by sol–gel autocombustion

“…These materials have high permeability at RF frequencies and possess the ability for improving the performance and miniaturization of various devices, such as antennae and micro inductors. The advantage of ferrites is that they yield higher efficiency and lower costs than that of other materials [2]. Among these magnetic materials, hexagonal ferrites have been playing a dominant role in the family of permanent magnet in the market due to their low costs, chemical stability and high frequency sustainability for several decades [2].…”

AC conductivity and dielectric properties of, Zn1−Cu Cr0.8Fe1.2O4 spinel ferrites

“…These opposite local displacements cause and determine the dielectric polarization in Cu containing ferrites such that the peaks occurring at some temperatures can be attributed to a collective contribution to the polarization by two types of charge carriers. This was observed by many researchers in the field [21,22]. We can obviously observe those peaks in the sample of x = 0.2 at temperatures ≥355 K. For the sample of x = 0.4 they occur at temperatures ≥385 K. Whereas for the samples of x ≥ 0.6, those peaks can be observed at almost all temperatures, this may be attributed to the increase in Cu ion content for which -as mentioned before in the discussion of conductivity -the effect of a fraction of Cu ions on increasing conductivity -i.e.…”

Electromagnetic properties of Ni and La doped strontium hexaferrites in the microwave region

“…Thus, the W-type hexaferrites of the system Co x Zn 2−x -W exhibit the sequence of orientational phase transitions axis-cone-plane of easy magnetization with the increase of Co 2+ concentration at room temperature, where the cobalt content x was found to promote the conical anisotropy when it varies in the range 0.7-0.9 [27] or 0.5-0.7 [10]. However, the existence of the intermediate preferred cone of easy magnetization is ignored in other studies of the systems Co x Zn 2−x -W [7,9] and Co x Ni 2−x -W [28]. From the general calculated magnetic phase diagrams [27] it is inferred that the axial anisotropy practically changes when the first order constant k 1 gets negative, since k 2 and k 3 are small compared to k 1 at room temperature.…”