Preparation and Magnetic Properties of Low Temperature Sintering Bi-Substituted Yttrium Iron Garnet
The low temperature sinterability and magnetic properties of Bi-substituted yttrium iron garnet (YIG) polycrystalline samples were studied in this paper. The results showed that Bi-substitution can lower garnet phase formation temperature from about 1200oC to 900oC and ceramic sintering temperature from over 1300oC to about 1050oC respectively. The Bi-substitution leads to a decrease in initial permeability and an increase in ferromagnetic resonance linewidth (ΔH) of sintered specimens. Saturation magnetization decreases and coercive force increases a few with an increase of Bi content. The mechanism of Bi-substitution on initial permeability and ΔH is discussed. The change in initial permeability of Bi-substituted specimens relative to unsubstituted YIG results from Bismuth volatilization and weakening of superexchange interaction. The lattice dilatation in Bi-substituted YIG gives cause for a decrease of saturation magnetization and an increase of coactivity force.
Wei Pan, Jianghong Gong, Chang-Chun Ge and Jing-Feng Li
H. J. Zhao et al., "Preparation and Magnetic Properties of Low Temperature Sintering Bi-Substituted Yttrium Iron Garnet", Key Engineering Materials, Vols. 280-283, pp. 481-484, 2005