Patent ID: 8829986

Claim:
An interconnect structure comprising: a metal line having a variable resistance portion disposed between a first circuit and a second circuit, said metal line connecting said first circuit with said second circuit and including: at least one flared-up portion acting as a metal reservoir; and at least one void that is variable in size disposed within said metal line, wherein: said metal line has a resistance that is a function of the size of said void, a first current having a pre-determined magnitude applied to said metal line in a first direction increases the size of said void due to electro-migration of metal atoms from said metal reservoir to a region near said void, thereby increasing the resistance of said metal line to a first resistance value, and a second current having said pre-determined magnitude applied to said metal line in a second direction that is opposite of said first direction decreases the size of said void due to electro-migration of metal atoms near said void to said metal reservoir, thereby decreasing the resistance of said metal line to a second resistance value.