High Figure of Merit Magneto‐Optical Ce‐ and Bi‐Substituted Terbium Iron Garnet Films Integrated on Si
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10.1002-adom.202100512.pdf
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Author(s)
Fakhrul, Takian
Tazlaru, Stana
Khurana, Bharat
Beran, Lukáš
Bauer, Jackson
Vančík, Michal
Marchese, Ariane
Tsotsos, Ekaterina
Kučera, Miroslav
Zhang, Yan
Date Issued
May 31, 2021
Journal
Advanced Optical Materials
Publisher
Wiley
Citation
Fakhrul, T., Tazlaru, S., Khurana, B., Beran, L., Bauer, J., Vančík, M., Marchese, A., Tsotsos, E., Kučera, M., Zhang, Y., Veis, M., Ross, C. A., High Figure of Merit Magneto-Optical Ce- and Bi-Substituted Terbium Iron Garnet Films Integrated on Si. Adv. Optical Mater. 2021, 9, 2100512.
Version
Author's final manuscript
Abstract
Films of polycrystalline terbium iron garnet (TbIG), cerium-substituted TbIG (CeTbIG), and bismuth-substituted TbIG (BiTbIG) are grown on Si substrates by pulsed laser deposition. The films grow under tensile strain due to thermal mismatch with the Si substrate, resulting in a dominant magnetoelastic anisotropy which, combined with shape anisotropy, leads to in-plane magnetization. TbIG has a compensation temperature of 253 K which is reduced by substitution of Ce and Bi. The Faraday rotation at 1550 nm of the TbIG, Ce0.36TbIG, and Bi0.03TbIG films is 5400 ± 600° cm−1, 4500 ± 100° cm–1, and 6200 ± 300° cm−1, respectively, while Ce0.36TbIG and Bi0.03TbIG exhibit lower optical absorption than TbIG, attributed to a reduction in Fe2+ and Tb4+ absorption pathways. The high Faraday rotation of the films, and in particular the high magneto-optical figure of merit of the Bi0.03TbIG of 720° dB−1 at 1550 nm, make these polycrystalline films valuable for applications in integrated photonics.
MIT Department
Massachusetts Institute of Technology. Department of Materials Science and Engineering
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DOI of Published Version
https://doi.org/10.1002/adom.202100512
