A programmable multiple data state memory cell including a first electrode
layer formed from a first conductive material, a second electrode layer
formed from a second conductive material, and a first layer of a
metal-doped chalcogenide material disposed between the first and second
electrode layers. The first layer providing a medium in which a
conductive growth can be formed to electrically couple together the first
and second electrode layers. The memory cell further includes a third
electrode layer formed from a third conductive material, and a second
layer of a metal-doped chalcogenide material disposed between the second
and third electrode layers, the second layer providing a medium in which
a conductive growth can be formed to electrically couple together the
second and third electrode layers.