Thermomagnetic recording of highly Bi-substituted iron garnet film using scanning laser for spatial light modulation

Thermomagnetic recording of highly Bi-substituted iron garnet film using scanning laser for spatial light modulation

Abstract Spatial light modulations (SLM) utilizing the magneto-optical (MO) effect of magnetic materials are expected to offer fast switching and small pixel sizes as small as the wavelength of the light. However, the small MO effect is a major issue. In this paper, we report a thermomagnetic record...

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Bibliographic Details
Published in:Japanese Journal of Applied Physics Vol. 63; no. 10; pp. 10 - 15
Main Authors: Sakaguchi, Hotaka, Honma, Takuma, Zhang, Jian, Awano, Hiroyuki, Sumi, Satoshi, Nonaka, Hirofumi, Chafi, Fatima Zahra, Ishibashi, Takayuki
Format: Journal Article
Language:English
Published: Tokyo IOP Publishing 01-10-2024
Japanese Journal of Applied Physics
Subjects:
Bi-substituted garnet film
Bismuth
Faraday effect
Galvanometers
Laser applications
Light modulation
Magnetic domains
Magnetic materials
magnetic recording
magnetic thin film
magneto-optical effect
Pixels
Recording
spatial light modulation
Substitutes
thermomagnetic recording
Yttrium-iron garnet
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Summary:Abstract Spatial light modulations (SLM) utilizing the magneto-optical (MO) effect of magnetic materials are expected to offer fast switching and small pixel sizes as small as the wavelength of the light. However, the small MO effect is a major issue. In this paper, we report a thermomagnetic recording of highly bismuth-substituted garnet film, known for large Faraday effects. Y 0.5 Bi 2.5 Fe 4 GaO 12 (Bi,Ga:YIG) film with a Faraday rotation of −4.66 degrees was used as an MO medium. A laser scanning thermomagnetic recording system using a Galvanometer mirror was developed and the size and quality of recorded magnetic domains were investigated. The smallest recorded magnetic domain diameter was 0.62 μm with a small standard deviation of 0.09 μm. Line patterns with a width of 1 μm can be recorded in this film. We found that Bi,Ga:YIG films have potential as a material for SLMs with fast switching, submicron pixel size, and large MO effect.
Bibliography:JJAP-S1104093.R1
ISSN:0021-4922
1347-4065
DOI:10.35848/1347-4065/ad7a7c