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Army

Improved magnetic memory storage

High density, stable, non-volatile memory with a longer archive life

Electronics

Magnetic memory storage has been a standard data archiving technology for decades, but this method of encoding information has two major disadvantages.

First, since the information is written by applying a magnetic field, the information can also be erased by exposure to a magnetic field. Archival magnetic tape, hard disks, and magnetic strips in credit cards, hotel cards, and ID cards, can all be corrupted by simple magnets. One could minimize the loss of information from exposure to a magnetic field by increasing the resistance of the material, but this would increase the cost of writing and reading the media.

Secondly, the magnetized state of the bits changes over time because of thermal instabilities. Non-magnetic methods of information storage do not presently possess the density of magnetic memory and generally do not retain information indefinitely. Though magnetic storage is still the primary method of information storage, considerable effort is spent each year duplicating the magnetic data to maintain data reliability.

To improve data stability and security Army researchers have developed a new technology that stores information in bits of high-and low-magnetic permeability. This approach has the major advantages that information is neither erased by applying a magnetic field nor will it be affected by thermal upsets because the changes in permeability due to temperature are small and reversible.

This patent 9,552,832 is a continuation-in-part and claims priority to U.S. patent 9,245,617 filed Aug. 27, 2014, which is a continuation-in-part and claims priority to U.S. Pat. No. 8,824,200, entitled “Nonvolatile Memory Cells Programmable by Phase Change,” filed Dec. 17, 2013. The ‘832 patent specifies a laser to heat the storage material thereby altering its magnetic permeability.

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