Structural, Optical, and Magnetic Properties of Erbium-Substituted Yttrium Iron Garnets

Yujin Cho, Seohui Kang, Yeon Woo Nahm, Ahmed Yousef Mohamed, Yejin Kim, Deok Yong Cho, Suyeon Cho

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We synthesized a series of slightly erbium-substituted yttrium iron garnets (Er:YIG), Y3-xErxFe5O12at different Er concentrations (x = 0, 0.01, 0.05, 0.10, and 0.20) using a solid-state reaction and investigated their structural, magnetic, and optical properties as a function of Er concentration. The volume of the unit cell slightly increased with Er concentration and Er atoms predominately replaced Y atoms in the dodecahedrons of YIG. The optical properties exhibited certain decreases in reflectance in the 1500-1600 nm wavelength range due to the presence of Er3+. Despite the many unpaired 4f electrons in Er3+, the total magnetic moments of Er:YIG showed similar trends with temperatures and magnetic fields above 30 K. An X-ray magnetic circular dichroism study confirmed the robust Fe 3d magnetic moments. However, the magnetic moments suddenly decreased to below 30 K with Er substitution, and the residual magnetism (MR) and coercive field (HC) in the magnetic hysteresis loops decreased to below 30 K with Er substitution. This implies that Er substitution in YIG has a negligible effect on magnetic properties over a wide temperature range except below 30 K where the Er 4f spins are coupled antiparallel to the majority Fe 3d spins. Our studies demonstrated that above 30 K the magnetic properties of YIG are retained even with Er substitution, which is evidence that the Er doping scheme is applicable for YIG-based magneto-optical devices in the mid-infrared regime.

Original languageEnglish
Pages (from-to)25078-25086
Number of pages9
JournalACS Omega
Issue number29
StatePublished - 26 Jul 2022

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