Magnetic spectra and Richter aftereffect relaxation in CexY3−xFe5O12 ferrites

Fu Chen,Yajie Chen,Xian Wang,Zekun Feng,Vincent G. Harris

doi:10.1063/1.4943536

Abstract

The static and dynamic magnetic properties of cerium (Ce) doped yttrium iron garnet CexY3−xFe5O12 (x=0, 0.05, 0.1, 0.15, 0.2) ferrites (YIG) have been reported in this work. The ferrites were fabricated by the traditional solid-state reaction method. All ferrite samples reveal pure garnet structure identified by x-ray diffraction (XRD). The substitution of cerium not only enhances the saturation magnetization of the samples, but also regulates the magnetocrystalline anisotropy constant K1. Obvious differences in permeability spectra over a frequency of 1 MHz - 1 GHz can be observed. It is verified that the permeability dispersion and magnetic losses of Ce-doped YIG ferrite contain the contribution of Richter aftereffect relaxation due to the existence of Fe2+ ions. The fitting results of the permeability spectra applied three-mechanism model is in good agreement with experimental data, which successfully explains the mechanisms of magnetic losses observed at 1 MHz to 1 GHz for Ce-doped YIG ferrite. In addition, the frequency shift of Richter aftereffect has also been discussed.

Highlights

The multifunctional integrated microwave electronic devices have attracted lots of attention in recent decades.[1]
It is verified that the permeability dispersion and magnetic losses of Ce-doped yttrium iron garnet (YIG) ferrite contain the contribution of Richter aftereffect relaxation due to the existence of Fe2+ ions
The fitting results of the permeability spectra applied three-mechanism model is in good agreement with experimental data, which successfully explains the mechanisms of magnetic losses observed at 1 MHz to 1 GHz for Ce-doped YIG ferrite

Summary

Introduction

The multifunctional integrated microwave electronic devices have attracted lots of attention in recent decades.[1]. As one of the most important gyromagnetic materials, Y3Fe5O12 (YIG) ferrite and its various dopants have been developed for new functional applications.[2,3]. Many kinds of doped yttrium iron garnet ferrites have been investigated in recent years, such as YBiCaVIG,[6] YGdIG,[7] YAlIG,[8] YTbIG,[9] etc. We aim to investigate the Ce-doped YIG ferrites for the static magnetic properties and the interesting dynamic magnetic behavior which reveals the potential magnetic aftereffect

Objectives

Results

Conclusion