Room temperature magnetization measurements of some substituted rare earth iron garnets

Effects of In3+-substitution on the structure and magnetic properties of multi-doped YIG ferrites with low saturation magnetizations

“…Similar results were recently reported by Xu et al [14] on a study of In-substitution in Bi-CVG ferrites, regardless of a different crossover around x¼ 0.4. Nevertheless, these results are different from that reported by Niyaifar et al [15], in which saturation magnetization for Y 3 found to decrease as the amount of In 3 + ions was increased to x¼ 0.2 and then turned to increase when the amount of In 3 + was further increased up to x ¼0.4. Obviously, with regard to the influence of In 3 + -substitution on structure and magnetic properties of YIG, full clarity has not yet been achieved and more researches are necessary so as to reach a better understanding.…”

“…These excellent properties make YIG-based single crystals and polycrystalline ceramics widely applied in microwave devices, such as circulators, isolators, phase shifters, etc. [1][2][3]. Nowadays, with the further development of microelectronics and radar technologies, microwave ferrites with high gyromagnetic properties continue to be in great demand.…”

The Structural and the Magnetic Properties of Aluminum Substituted Yttrium Iron Garnet

“…YIG and substituted YIG provide remarkable performance in microwave devices due to their tunable magnetization and low dielectric losses 2,3 . , where Y 3+ ions occupy dodecahedral sites and magnetic Fe 3+ ions occupy octahedral [a-sublattice] and tetrahedral (d-sublattice) sites, are determined by the strength of the superexchange interactions between magnetic ions in the various sublattices [4][5][6][7] . Accordingly, the substitution of Y 3+ ions by other rare earth ions, and/or Fe 3+ ions by nonmagnetic ions were adopted for successful modification of the magnetic properties of YIG for potential technological applications 3 .…”

Effect of Al-substitution on Structural and Magnetic Properties of Er3Fe5-xAlxO12 Garnets

“…, where R 3+ is a trivalent rare-earth ion occupying dodecahedral (c) sites, and Fe 3+ ions occupy octahedral [a-sublattice] and tetrahedral (d-sublattice) sites in the garnet lattice. The magnetic properties of the garnet are determined by the strength of the superexchange interactions between magnetic ions in the various sublattices [3][4][5][6]. Since Y 3+ ion does not have magnetic moment, the magnetic properties of YIG are completely determined by a−d superexchange interactions between Fe 3+ ions at tetrahedral and octahedral sites, resulting in a net moment of 5 μ B per molecule at 0 K. If R 3+ is a rare earth ion with net magnetic moment, however, the a−d superexchange interaction is much stronger than a−c and d−c interactions between R 3+ and Fe 3+ ions, and the rare earth [RE] sublattice couples antiferromagnetically with the net moment of the Fe 3+ sublattices.…”