Electroforming-free BiFeO3 switches for neuromorphic computing: Spike-timing dependent plasticity (STDP) and cycle-number dependent plasticity (CNDP). - Mahdi Kiani; Nan Du 004; Danilo Bürger; Ilona Skorupa; Ramona Ecke; Stefan E. Schulz; Heidemarie Schmidt (ICECS, 2019)