Berlin 2015 – scientific programme

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DS: Fachverband Dünne Schichten

DS 8: Application of Thin Films

DS 8.4: Talk

Monday, March 16, 2015, 19:30–19:45, H 0111

Spike-timing dependent plasticity in BiFeO₃ based artificial synapses — •N. Du¹, T. You¹, M. Kiani¹, C. Mayr², R. Schueffny³, D. Buerger¹, I. Skorupa^1,4, O. G. Schmidt^1,5, and H. Schmidt¹ — ¹TU Chemnitz — ²University of Zurich and ETH Zurich — ³TU Dresden — ⁴HZDR — ⁵IFW Dresden

With the rapid progress in complementary metal-oxide-semiconductor (CMOS) integrated circuit technology, also a fast development of neuromorphic cognitive systems is expected. In this work spike-timing dependent plasticity (STDP) [1] with one pairing of a single presynaptic spike and of a single postsynaptic spike has been investigated in BiFeO₃-based artificial synapses. The forming-free, nonvolatile, analog resistive switching of BiFeO₃ [2] allows to adjust the synaptic weight of BiFeO₃-based artificial synapses in dependence on the time delay between the single pre- and postspike in classical STDP with 60-80 single pairings [3] and in STDP with one single pairing. Due to the easy pulse sequence in one single pairing STDP, the time delay could be reduced to few microseconds, memory consolidation in delay learning could be investigated, and energy consumption per setting pulse could be reduced to only 4.5 pJ. Using BiFeO₃-based artificial synapses with different flexible electrodes [4], we have realized STDP, Anti-STDP and both STDP/Anti-STDP within a single cell! [1] G. S. Snider, In Proc. IEEE Int. Symp. Nanoscale Architechtures, 85-92 (2008) [2] Y. Shuai, N. Du et al., IEEE Elec. Dev. Lett. 34, 54-56 (2013) [3] C. Mayr, N. Du et al., Adv. Neural Inf. Process. Syst. 25, 1700-1708 (2012) [4] T. You, N. Du et al., Adv. Funct. Mater. 24, 3357-3365 (2014)