Abstract
We found that in weakly coupled giant magnetoresistance (GMR) superlattices, the small-field response's slope is dependent on its past magnetic history. On the basis of this storage mechanism, we designed and developed a one-bit binary solid-state memory element. We also succeeded in fabricating a one-bit quaternary memory based on the fact that there are four stable states under a zero field in weakly coupled superlattices. Finally, we studied the possibility of what is called spin-tunneling GMR memory. An experiment showed that a similar storage mechanism exists in tunneling junctions, and analysis confirmed a large SNR in this configuration.
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