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Accelerated Ionic Motion in Amorphous Memristor Oxides for Nonvolatile Memories and Neuromorphic Computing
Author(s) -
Schmitt Rafael,
Kubicek Markus,
Sediva Eva,
Trassin Morgan,
Weber Mads C.,
Rossi Antonella,
Hutter Herbert,
Kreisel Jens,
Fiebig Manfred,
Rupp Jennifer L. M.
Publication year - 2019
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201804782
Subject(s) - neuromorphic engineering , memristor , materials science , amorphous solid , ionic bonding , resistive random access memory , resistive touchscreen , nanotechnology , non volatile memory , optoelectronics , electrode , computer science , electronic engineering , artificial neural network , ion , physics , chemistry , artificial intelligence , organic chemistry , quantum mechanics , engineering , computer vision
Memristive devices based on mixed ionic–electronic resistive switches have an enormous potential to replace today's transistor‐based memories and Von Neumann computing architectures thanks to their ability for nonvolatile information storage and neuromorphic computing. It still remains unclear however how ionic carriers are propagated in amorphous oxide films at high local electric fields. By using memristive model devices based on LaFeO 3 with either amorphous or epitaxial nanostructures, we engineer the structural local bonding units and increase the oxygen‐ionic diffusion coefficient by one order of magnitude for the amorphous oxide, affecting the resistive switching operation. We show that only devices based on amorphous LaFeO 3 films reveal memristive behavior due to their increased oxygen vacancy concentration. We achieved stable resistive switching with switching times down to microseconds and confirm that it is predominantly the oxygen‐ionic diffusion character and not electronic defect state changes that modulate the resistive switching device response. Ultimately, these results show that the local arrangement of structural bonding units in amorphous perovskite films at room temperature can be used to largely tune the oxygen vacancy (defect) kinetics for resistive switches (memristors) that are both theoretically challenging to predict and promising for future memory and neuromorphic computing applications.