US Patent 5,574,281
United States Patent and Trademark Office
University of Iowa Research Foundation (Iowa City, IA, US)
A device capable of storing information, comprising a new sulfide alloy embedded in a substrate, the alloy exhibiting a metal-semiconductor phase transition with hysteresis as a function of temperature and a positive temperature coefficient. In one embodiment of the device the bistable material may be represented by the formula Ba(Co1-x Nix)S2-y, wherein x is between 0 and 1 and y varies from 0-2.
Martinson, Lee S.; Schweitzer, John W.; and Baenziger, Norman C. Sensing device for incorporating thermally bistable material. US Patent 5,574,281 filed November 14, 1994 and issued November 12, 1996. https://ir.uiowa.edu/patents/156