BiFeO3 bilayer structures for implementing beyond von-Neumann computing

The conventional von-Neumann architecture, which physically separates processing and memory operations, is limited in so much as the processor cannot execute a program faster than instructions and data can be fetched from and returned to memory[1]. Resistive switching devices[2] are considered as one of the most promising candidates for carrying out the processing and storage simultaneously and at the same device cell. In this work, we present a BiFeO3:Ti/BiFeO3 bilayer structure which shows stable and nonvolatile resistive switching behaviour under both positive and negative bias. With the same writing bias, the bilayer structure shows different resistance state for the different polarity of reading bias. The resistance states are distinguishable and stable enough for the practical applications. For the logic applications, the polarity of reading bias can be used as an additional logic variable, which makes it feasible to program and store all 16 Boolean logic functions simultaneously and into a same single bilayer structure cell in three logic cycles. [1] C. D. Wright, et al., Adv. Funct. Mater., 2013, 23, 2248 [2] A. Bogusz, T. You, et al., accepted in Proc. IEEE (2013)