Magnetic Holography and Its Application to Data Storage
The principle of magnetic holograms and its application to holographic memory are reviewed. A magnetic hologram was recorded through a thermomagnetic recording as a difference in magnetization direction and reconstructed with the magneto-optical effect. To achieve a bright reconstruction image, it i...
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Format: | Article |
Language: | English |
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MDPI AG
2021-05-01
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Series: | Photonics |
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Online Access: | https://www.mdpi.com/2304-6732/8/6/187 |
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author | Yuichi Nakamura |
author_facet | Yuichi Nakamura |
author_sort | Yuichi Nakamura |
collection | DOAJ |
description | The principle of magnetic holograms and its application to holographic memory are reviewed. A magnetic hologram was recorded through a thermomagnetic recording as a difference in magnetization direction and reconstructed with the magneto-optical effect. To achieve a bright reconstruction image, it is important to record deep magnetic fringes on the materials with large Faraday rotation coefficients. This technique was applied to the holographic memory using transparent magnetic garnets as a recording material. The first reconstruction image was dark and noisy, but improvements in the recording conditions resulted in error-free recording and reconstruction of the magnetic hologram. To form deep magnetic fringes, insertion of heat dissipation (HD) layers into recording layer was proposed. It was found that this HD multilayer medium showed diffraction efficiency higher than that of a single layer medium, and error-free recording and reconstruction were also achieved, using magnetic assisted recording. These results suggest that HD multilayer media have potential applications in recording media of magnetic holographic data storage. In future, a high recording density technique, such as multiple recording, should be developed. |
first_indexed | 2024-03-10T11:03:34Z |
format | Article |
id | doaj.art-8026f507f6dc4e61b5d6aaee8a72add1 |
institution | Directory Open Access Journal |
issn | 2304-6732 |
language | English |
last_indexed | 2024-03-10T11:03:34Z |
publishDate | 2021-05-01 |
publisher | MDPI AG |
record_format | Article |
series | Photonics |
spelling | doaj.art-8026f507f6dc4e61b5d6aaee8a72add12023-11-21T21:21:15ZengMDPI AGPhotonics2304-67322021-05-018618710.3390/photonics8060187Magnetic Holography and Its Application to Data StorageYuichi Nakamura0Department of Electrical and Electronic Information Engineering, Toyohashi University of Technology, Toyohashi 441-8580, JapanThe principle of magnetic holograms and its application to holographic memory are reviewed. A magnetic hologram was recorded through a thermomagnetic recording as a difference in magnetization direction and reconstructed with the magneto-optical effect. To achieve a bright reconstruction image, it is important to record deep magnetic fringes on the materials with large Faraday rotation coefficients. This technique was applied to the holographic memory using transparent magnetic garnets as a recording material. The first reconstruction image was dark and noisy, but improvements in the recording conditions resulted in error-free recording and reconstruction of the magnetic hologram. To form deep magnetic fringes, insertion of heat dissipation (HD) layers into recording layer was proposed. It was found that this HD multilayer medium showed diffraction efficiency higher than that of a single layer medium, and error-free recording and reconstruction were also achieved, using magnetic assisted recording. These results suggest that HD multilayer media have potential applications in recording media of magnetic holographic data storage. In future, a high recording density technique, such as multiple recording, should be developed.https://www.mdpi.com/2304-6732/8/6/187magnetic hologrammagneto-optical effectthermomagnetic recordingmagnetic holographic memory |
spellingShingle | Yuichi Nakamura Magnetic Holography and Its Application to Data Storage Photonics magnetic hologram magneto-optical effect thermomagnetic recording magnetic holographic memory |
title | Magnetic Holography and Its Application to Data Storage |
title_full | Magnetic Holography and Its Application to Data Storage |
title_fullStr | Magnetic Holography and Its Application to Data Storage |
title_full_unstemmed | Magnetic Holography and Its Application to Data Storage |
title_short | Magnetic Holography and Its Application to Data Storage |
title_sort | magnetic holography and its application to data storage |
topic | magnetic hologram magneto-optical effect thermomagnetic recording magnetic holographic memory |
url | https://www.mdpi.com/2304-6732/8/6/187 |
work_keys_str_mv | AT yuichinakamura magneticholographyanditsapplicationtodatastorage |