Journal
ADVANCED OPTICAL MATERIALS
Volume 9, Issue 16, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adom.202100512
Keywords
Faraday rotation; magneto-optical figure of merit; magneto-optical materials; optical absorption; rare-earth iron garnets
Categories
Funding
- NSF [ECCS 2028199]
- Micron Foundation
- Draper Laboratories
- MRSEC Program of the National Science Foundation [DMR 1419807]
- Czech Ministry of Education [LTAUSA18176]
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Films of polycrystalline terbium iron garnet (TbIG), cerium-substituted TbIG (CeTbIG), and bismuth-substituted TbIG (BiTbIG) were successfully grown on Si substrates using pulsed laser deposition. The films grow under tensile strain due to thermal mismatch with the Si substrate, leading to a dominant magnetoelastic anisotropy and in-plane magnetization. Substitution of Ce and Bi reduces the compensation temperature of TbIG, resulting in lower optical absorption and high Faraday rotation, particularly in the case of Bi(0.03)TbIG with a high magneto-optical figure of merit at 1550 nm.
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, Ce(0.36)TbIG, and Bi(0.03)TbIG films is 5400 +/- 600 degrees cm(-1), 4500 +/- 100 degrees cm(-1), and 6200 +/- 300 degrees cm(-1), respectively, while Ce(0.36)TbIG and Bi(0.03)TbIG 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 Bi(0.03)TbIG of 720 degrees dB(-1) at 1550 nm, make these polycrystalline films valuable for applications in integrated photonics.
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