We found that a magnetic tunnel junction (MTJ) shows two types of memory operation. One is spin torque switching, and the other is electric stress induced resistive switching (RS), which is observed in various metal oxides. A MTJ in RS operation exhibits a resistance ratio of greater than 100, an endurance of more than 400 cycles, and data retention in excess of 89 h at 85 degrees C, which is suitable for programable switch elements. The MTJ can operate as a programable switch, as well as a storage element, in a field programable gate array. (c) 2008 American Institute of Physics.
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