Broadband Free Space Impedance in $\mathrm{C}{\mathrm{o}}_2\mathrm{Z}$ Hexaferrites by Substitution of Quadrivalent Heavy Transition Metal Ions for Miniaturized RF Devices

Piotr Kulik, Gavin Winter, Alexander Sokolov +5

Polycrystalline samples of Z-type hexaferrites, having nominal compositions $\mathrm{B}{\mathrm{a}}_3\mathrm{C}{\mathrm{o}}_{2+\mathrm{x}}\mathrm{F}{\mathrm{e}}_{24-2x}{\mathrm{M}}_{\mathrm{x}}{\mathrm{O}}_{41}$ where M = $\mathrm{I}{\mathrm{r}}^{4+},\mathrm{H}{\mathrm{f}}^{4+},\mathrm{M}{\mathrm{o}}^{4+}$ and x=0 and 0.…