International Business Machines Corporation
Magnetic tunnel junction (MTJ) for multi-key encryption

Abstract:

A memory system in an integrated circuit and a method of operation. The system includes multiple magnetic tunnel junction (MTJ) structures, each MTJ structure storing a logic value according to a resistive state. A selection switch device associated with a respective MTJ structure is activated to select one of the multiple MTJ structures at a time. An output circuit is configured to sense the resistive state of a selected MTJ structure, the output circuit having a selectable input reference resistance value according to a selected first reference resistance or a second reference resistance value, and outputting a first logic value of the selected MTJ structure responsive to a resistive state of the MTJ structure and a selected first resistance reference value, or alternately outputting a second logic value of the selected MTJ structure responsive to the resistive state of the MTJ structure and a selected second resistance reference value.