Magnetic Spectra and Richter Aftereffect Relaxation in Zirconium-Doped Yttrium Iron Garnet Ferrites

摘要

The magnetic property and the magnetic aftereffect relaxation of zirconium (Zr)-doped yttrium iron garnet (YIG) YFeZrO ( and 0.1) have been investigated. The ferrites were fabricated by the traditional solid-state reaction method. A crystalline structure and an elemental spectrum analysis were identified by powder X-ray diffraction and using X-ray photoelectron spectroscopy, respectively. Both of the ferrite samples reveal a single-phase garnet structure, but show a visible difference in permeability spectra between the two samples over a frequency of 1 MHz–1 GHz. It is verified that the Zr-doped YIG ferrite contains the contribution of Richter aftereffect relaxation to magnetic spectrum due to the existence of Fe ions. The fitting of the permeability spectra in terms of the Richter model is in agreement with experimental data, which successfully accounts for the causes of magnetic losses observed at 1 MHz–1 GHz for the Zr-doped YIG ferrite.