Indium-substitution and indium-less case effects on structural and magnetic properties of yttrium-iron garnet. (October 2015)

• Record Type: Journal Article
• Authors: Nazlan, Rodziah; Hashim, Mansor; Ibrahim, Idza Riati; Idris, Fadzidah Mohd; Ismail, Ismayadi; Ab Rahman, Wan Norailiana Wan; Abdullah, Nor Hapishah; Zulkimi, Muhammad Misbah Muhammad; Mustaffa, Muhammad Syazwan
• Is Part Of: Journal of physics and chemistry of solids. Volume 85(2015:Oct.)
• Page Start: 1
• Page End: 12
• Publication Date: 2015-10
• Subjects: Magnetic materials -- Raman spectroscopy -- X-ray diffraction -- Magnetic properties -- Magnetic structure; Solids -- Periodicals; Solides -- Périodiques; Solids; Periodicals; 530.41
• DOI: 10.1016/j.jpcs.2015.04.011
• Languages: English
• ISSNs: 0022-3697

Abstract

Abstract: The effect of indium (In) substitution in the dynamics of structure and ferrimagnetism of yttrium iron garnet (YIG) employing sintering temperature as a temporary agent of composition and structural changes was reported in this study. The nanoparticles of YIG powder samples with various In content ( x =0.0–0.4) were prepared via the mechanical alloying (MA) technique. A brief, yet revealing characterization of the samples was carried out via transmission electron microscope, X-ray diffraction, Raman spectroscopy, B – H Hysteresisgraph, and LCR-metre. The X-ray diffraction analysis of the samples prepared via the MA indicates the formation of single phase YIG structure at much lower sintering temperature than that in the conventional ceramic technique. The lattice constant increases as In content increases which obeys Vegard's Law due to the larger In 3+ ions replacing the smaller Fe 3+ ions. The saturation induction increased reaching about 699.1 G for x =0.3 and decreased with further In substitution. Three stages of ordered magnetism formation were identified which attributed to development of crystallinity and larger grains for magnetic domain accommodation. The Curie temperature shows a decrement in their values with In content due to weakening of superexchange interactions. Raman shifts from 268.1 to 272.2 cm −1 with increasing In content were observed due to stress developed in the YIG crystal structure. Highlights: The effect of indium dopant on structure and magnetic properties of Y3 Fe5− x In x O12 was reported. The samples were characterized using TEM, XRD, Raman Spectroscopy, BH hysteresisgraph and LCR-metre. The composition of In x =0.3 shows the maximum saturation induction value. The hysteresis loss reduced with increasing Indium content. The Curie temperature decreased with increasing indium content due to weakening of superexchange interactions.