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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Main Author: Yuichi Nakamura
Format: Article
Language:English
Published: MDPI AG 2021-05-01
Series:Photonics
Subjects:
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.
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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