A vertical elevated pore structure for a phase change memory may include a pore with a lower electrode beneath the pore contacting the phase change material in the pore. The lower electrode may be made up of a higher resistivity lower electrode and a lower resistivity lower electrode underneath the higher...http://www.google.es/patents/US7049623?utm_source=gb-gplus-sharePatente US7049623 - Vertical elevated pore phase change memory
