The magnitude of the current exceeding the threshold current density initiates electromigration of the source/drain silicide into the channel region, such that {HEAD ~ the source/drain} of {TAIL ~ the FET} is shorted to the substrate after programming 
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The magnitude of the current exceeding the threshold current density initiates electromigration of the source / drain silicide into the channel region , such that { HEAD ~ the source / drain } of { TAIL ~ the FET } is shorted to the substrate after programming
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH