The progresses of MRAM as a memory to save energy consumption and its potential for further reduction

Abstract

Critical switching current, I_sw, of STT (Spin Transfer Torque)-MRAM has been reduced by several orders with perpendicular MTJ and the state-of-the-art write charge, Q_w, becomes the order of 100-150fC. With the small Q_w, MRAM starts to save energy consumption by 70-80% compared with a conventional memory system. Analysis of the write pulse-width dependence of I_w revealed a further potential of perpendicular MTJ to reduce I_w and Q_w. STT-MRAM is thought to achieve a further reduction of energy consumption.