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Researchers have now created a new type of holographic memory device that can store a large amount of datausing spin waves.
The device developed by researchers at the University of California, Riverside Bourns College of Engineering and Russian Academy of Science paves way for new kind of memory storage devices that can store large amount of data in three dimensions.
"The results open a new field of research, which may have tremendous impact on the development of new logic and memory devices," said Alexander Khitun, the lead researcher, who is a research professor at UC Riverside, according to a news release.
The device exploits spin wave interference or collective oscillations of spins in magnets. Currently, storage devices use optical beams. Holography is a technique that captures light scattered by an object, and then presents it in such a way that the observer sees it as a three-dimensional image. The technique, also called "lens-less" photography, captures interference pattern at the film, which makes the image more detailed than a conventional photograph. Holograms seen in driver's licenses and currency notes are just few examples of the technique at work.
There is a demand for an innovative storage method for storing large volumes of data at ultra-high recording density and at ultra-high speed. Magnetic-holographic memory meets this demand. This new technology enables more than 1 TB worth of data (equivalent to the total capacity of 40 Blu-ray discs, each with a typical capacity of 25 GB) to be recorded in a disc the size of a DVD or Blu-ray disc.
The research group led by Yuichi Nakamura, Associate professor at Toyohashi University of Technology, has applied this magnetic assist recording technology to magnetic-holographic memory and, for the first time in the world, succeeded in reducing recording energy consumption and achieving non-error data reconstruction.
Until now it has been difficult to obtain a clear reconstruction image with a magnetic hologram, due to strict requirements for material characteristics, optical conditions, and so on. Using magnetic assist recording, we have relaxed these requirements and also improved the reconstruction performance of recording media. This technology is promising for the future application of magnetic-holographic memory,"