Quarternary giant magnetoresistance random access memory

We designed a quaternary memory using weakly coupled giant magnetoresistance (GMR) multilayers based on the fact that there are four stable states when the applied field is zero. Compared with conventional binary memory, the major advantage oi the quarternary GMR memory is that we can simply double its capacity. This design's feasibility has been proved by experiments. (C) 1996 American Institute of Physics.