Saba Khadivianazar1,2, Mathias Rommel1, *Roland Weingaertner1, Birgit Kallinger1, Maria Kolesnik-Gray2, Vojislav Krstic2
(1. Fraunhofer Institute for Integrated Systems and Device Technology IISB(Germany), 2. Department of Physics, Staudtstr. 7, Bau A3, 91058 Erlangen(Germany))