Phase change memory cell including multiple phase change material portions

摘要

A memory cell includes a first electrode (122), a second electrode (130), and a first portion (124) of phase-change material contacting the first electrode. The memory cell includes a second portion (128) of phase-change material contacting the second electrode and a third portion (126) of phase-change material between the first portion and the second portion. A phase-change material composition of the third portion and the second portion gradually transitions from the third portion to the second portion.