Temperature dependence of spin resonance in cobalt substituted NiZnCu ferrites

TL;DR

This study investigates how cobalt substitution affects the magnetic resonance properties of NiZnCu ferrites across temperatures, revealing changes in permeability, resonance sharpness, and spin reorientation influenced by cobalt content.

Contribution

It provides new insights into the temperature-dependent magnetic resonance behavior of cobalt-doped NiZnCu ferrites, highlighting the role of cobalt in magnetocrystalline anisotropy.

Findings

Cobalt substitution decreases permeability and increases the b5d7fr factor.

Permeability spectrum exhibits a sharp resonance with cobalt doping.

Spin reorientation occurs at a cobalt-dependent temperature.

Abstract

Cobalt substitutions were investigated in Ni0.4Zn0.4Cu0.2Fe2O4 ferrites, initial complex permeability was then measured from 1 MHz to 1 GHz. It appears that cobalt substitution led to a decrease in the permeability and an increase in the \mus\timesfr factor. As well, it gave to the permeability spectrum a sharp resonance character. We also observed a spin reorientation occurring at a temperature depending on the cobalt content. Study of the complex permeability versus temperature highlighted that the most resonant character was obtained at this temperature. This shows that cobalt contribution to second order magnetocrystalline anisotropy plays a leading role at this temperature.