Sensing of Spintronic Memories

Abstract

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STDP implementation using multi-state spin−orbit torque synapse

“…Figure 7 demonstrates the implementation of the multistate SOT synapse in a network with two presynaptic neurons (11,12) and two postsynaptic neurons (21,22). As shown in this figure, the learning circuit can be shared between all synapses connected to the same input neuron.…”

“…The FL's magnetization direction can be switched by passing a current higher than a critical current (IC) in the appropriate direction, while the PL's magnetization direction is fixed. The relative magnetization direction of FL and PL determines the MTJ resistance [21,22]. MTJ resistance is in a low state when the magnetization directions of the two magnetic layers are parallel sate (P-state), and it is in a high state if the magnetization directions of the two layers are anti-parallel state (AP-state), which means the MTJ is a bistate device.…”

Spin–orbit torque flash analog-to-digital converter

“…Spin–orbit torque (SOT)-based MTJs have been proposed to overcome this issue while improving the switching efficiency 15 . In SOTs, a charge current ( I SOT ) greater than the critical charge current ( I SOT,crit ) flows through a heavy metal (HM) and the switching is accomplished by SOT through the spin Hall effect (SHE) 16 , 17 .…”