PHASE CHANGEABLE MEMORY DEVICE

摘要

PURPOSE: A phase change memory device is provided to improve the data preserving characteristic and the durability of the device by being composed of a phase change material film containing germanium, tellurium, and selenium and a phase change auxiliary film containing germanium. CONSTITUTION: A first electrode(412) is prepared. A second electrode(464) is separated from the first electrode. A phase change material film(440) is arranged between the first electrode and the second electrode. A phase change auxiliary film(432) covers at least part of the phase change material film and is separated from the first electrode. The phase change auxiliary film contains at least one of components composing the phase change material film.