Patent ID: 7786462

Claim:
An electrical device comprising a chalcogenide material, said chalcogenide material comprising Ge, Sb, and Te; said Ge having an atomic concentration between 11% and 18%, said Sb having an atomic concentration between 37% and 61.1%, and said Te having an atomic concentration between 27% and 45%; a first electrode in electrical communication with said chalcogenide material; and a second electrode in electrical communication with said chalcogenide material, said device having: a virgin state, a first set state formed by setting said virgin state, a first reset state formed by resetting said first set state, a second set state formed by setting said first reset state, a second reset state formed by resetting said second set state, and a third set state formed by setting said second reset state, wherein the resistance of said first set state differs from the resistance of said virgin state by less than 50%.