Formation of Y3Fe5O12 matrix including ε-phase Fe2O3 with the giant coercive field via optimized sol–gel method

Jang, Min-Sun; Ok, Hye-Jin; Oh, Inseon; Kang, Gu‐Hyeok; Yoo, Jung‐Woo; Lee, Ki‐Suk

doi:10.1016/j.jmmm.2022.169218

Cited by 5 publications

(1 citation statement)

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“…The magnetic hysteresis curves of Y 3– x Er x Fe 5 O 12 were retained up to room temperature with the coercive field ( H C ) and residual magnetization ( M R ) of Y 3– x Er x Fe 5 O 12 . The changes in H C and M R are explained by impeditive spin ordering at the surface of the Er:YIG powder or the formation of secondary phases. ,, Figure b shows that the H C and M R are almost invariant to the Er content at 300 K, while the H C and M R at 2 K decrease with the Er content. Therefore, the decrease of H C and M R at low temperature are hardly related to particle sizes or impurity phases in Er:YIG.…”

Section: Resultsmentioning

confidence: 96%

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

et al. 2022

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We synthesized a series of slightly erbium-substituted yttrium iron garnets (Er:YIG), Y 3– x Er x Fe 5 O 12 at 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 Er 3+ . Despite the many unpaired 4f electrons in Er 3+ , 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 ( M R ) and coercive field ( H C ) 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.

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Section: Resultsmentioning

confidence: 96%