Ferroelectric Zr0.5Hf0.5O2 thin films for nonvolatile memory applications - Mueller, J.; Boescke, T. S.; Braeuhaus, D.; Schroeder, U.; Boettger, U.; Sundqvist, Jonas; Kuecher, P.; Mikolajick, Thomas; Frey, Lothar (Applied Physics Letters, 2011)