Development of heat dissipation multilayered media for magnetic hologram memory

Yuichi Nakamura, Pang Boey Lim, Taichi Goto, Hironaga Uchida, Mitsuteru Inoue

Research output: Contribution to journalArticlepeer-review


Holographic memory is a strong candidate for next-generation optical storage with high recording densities and data transfer rates, and magnetic hologram memory using a magnetic garnet, as the recording material, is expected to be used as a rewritable and stable storage technology. We succeeded in recording and reconstruction of 2D data in magnetic hologram without error. However, the diffraction efficiency is insufficiently high for actual storage devices. To increase the diffraction efficiency, it is important to record deep magnetic fringes whereas the merging of fringes due to the excess heat near the medium surface generated during the thermomagnetic recording process must be suppressed. To avoid this merge of fringes, we proposed a multi-layered structure in which the magnetic layers are divided by the transparent heat dissipation layers (HDL) to control the heat diffusion. In this study, we propose a simple thermal design method for designing the HDL multilayer structure. Using this model, we designed and fabricated a HDL multilayer medium in which the recording magnetic layers are discrete in the film. The HDL multilayer medium exhibited diffraction efficiency higher than that of the single layer medium, and error-free recording and reconstruction were achieved using the magnetic assist technique.

Original languageEnglish
Pages (from-to)125-130
Number of pages6
JournalIEEJ Transactions on Fundamentals and Materials
Issue number3
Publication statusPublished - 2020
Externally publishedYes


  • Magnetic hologram memory
  • Recording medium
  • Thermomagnetic recording

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


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