FUJIFILM: Developed new magnetic recording method: Millimeter wave / terahertz wave
University of Tokyo
Institute of Laser Engineering Osaka University
FUJIFILM Recording Media Research Institute
Collaborative research group:
Succeeded in developing a new magnetic recording method “millimeter wave magnetic recording” using millimeter waves and terahertz waves.
Modern society has entered the era of big data and IoT.
Data archiving is one of the key basic technologies.
Magnetic tape:
Reliable for long-term record keeping
Because of power saving and low cost
As a cloud or commercial data archive
It is actively used and demand is growing.
Condensing millimeter-wave assisted magnetic recording: F-MIMR
Professor Ogoshi and his colleagues are aiming to establish millimeter-wave magnetic recording.
We proposed a new method called “Focused Millimeter wave–assisted Magnetic Recording (F-MIMR)”.
Outline of R & D:
Developed epsilon iron oxide / magnetic film:
We have produced a magnetic film of epsilon iron oxide * 3, which is attracting attention as a millimeter-wave absorber for Beyond 5G * 2.
Developed a condensing millimeter wave generator:
We have developed a condensing millimeter-wave generator that uses a terahertz (THz) light source.
Irradiate the film with condensed millimeter waves:
Irradiate the epsilon iron oxide magnetic film with condensed millimeter waves.
Then, the magnetic pole direction was reversed, and writing could be confirmed.
Beyond 5G magnetic recording method:
This F-MIMR is “a combination of Beyond 5G light / electromagnetic waves and magnetic recording.”
This is an epoch-making magnetic recording method in the Beyond 5G era.
It is possible to significantly increase the magnetic recording density.
Resou
https://resou.osaka-u.ac.jp/ja/research/2020/20201008_2
Magnetic‐Pole Flip by Millimeter Wave – Ohkoshi – – Advanced Materials
Abstract
In the era of Big Data and the Internet of Things, data archiving is a key technology.
From this viewpoint,
magnetic recordings
are drawing attention because they guarantee long‐term data storage.To archive an enormous amount of data, further increase of the recording density is necessary.
Herein a new magnetic recording methodology,
“focused‐millimeter‐wave‐assisted magnetic recording (F‐MIMR),” is proposed.
To test this methodology, magnetic films based on epsilon iron oxide nanoparticles
are prepared and a focused‐millimeter‐wave generator is constructed using terahertz (THz) light.
Irradiating the focused millimeter wave to epsilon iron oxide instantly switches its magnetic pole direction.The spin dynamics of F‐MIMR
are also calculated using the stochastic Landau–Lifshitz–Gilbert model considering all of the spins in an epsilon iron oxide nanoparticle.In F‐MIMR, the heat‐up effect of the recording media is expected to be suppressed.
Thus, F‐MIMR can be applied to high‐density magnetic recordings.
Wiley Online Library
https://onlinelibrary.wiley.com/doi/full/10.1002/adma.202004897