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Open AccessArticle

Influence of Sputtered ZnO and Al:ZnO Top Layers on Magneto-Optic Responses of Yttrium Iron Garnet Films

1
Department of Electronic Engineering, National Institute of Technology, Tokyo College, Hachioji, Tokyo 193-1997, Japan
2
Department of Electrical and Electronic Information Engineering, Toyohashi University of Technology, Toyohashi, Aichi 441-8580, Japan
*
Author to whom correspondence should be addressed.
Crystals 2018, 8(10), 396; https://doi.org/10.3390/cryst8100396
Received: 30 August 2018 / Revised: 10 October 2018 / Accepted: 17 October 2018 / Published: 22 October 2018
Zinc oxide (ZnO) is a promising material for combining with magneto-optic (MO) materials because it can propagate stable exciton-polaritons, with velocities considerably lower than that of photons in a vacuum. This study investigated the influence of sputtered ZnO and Al:ZnO top layers on MO responses of a bismuth-substituted yttrium iron garnet (Bi:YIG) film. The ZnO top layer modulated the Faraday rotation and magnetic circular dichroism (MCD) of the Bi:YIG around the exciton resonance wavelength of ZnO at 369 nm. Furthermore, Al-substituted ZnO, which is a conductive ZnO, also changed the MO effects around the exciton resonance wavelength. These results imply that the exciton-polaritons in ZnO affect the MO interaction, because of their considerably low group velocity. The results suggest potential for controlling the MO response via excitons. View Full-Text
Keywords: magneto-optical effect; magnetic garnet; zinc oxide; exciton; polariton magneto-optical effect; magnetic garnet; zinc oxide; exciton; polariton
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MDPI and ACS Style

Mito, S.; Kikuchi, S.; Ito, Y.; Ota, N.; Inoue, M. Influence of Sputtered ZnO and Al:ZnO Top Layers on Magneto-Optic Responses of Yttrium Iron Garnet Films. Crystals 2018, 8, 396.

AMA Style

Mito S, Kikuchi S, Ito Y, Ota N, Inoue M. Influence of Sputtered ZnO and Al:ZnO Top Layers on Magneto-Optic Responses of Yttrium Iron Garnet Films. Crystals. 2018; 8(10):396.

Chicago/Turabian Style

Mito, Shinichiro; Kikuchi, Satsuki; Ito, Yasutoshi; Ota, Nana; Inoue, Mitsuteru. 2018. "Influence of Sputtered ZnO and Al:ZnO Top Layers on Magneto-Optic Responses of Yttrium Iron Garnet Films" Crystals 8, no. 10: 396.

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