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Rahman MA, Tawfik SA, Ahmed T, Spencer MJS, Walia S, Sriram S, Bhaskaran M. Differential Work-Function Enabled Bifunctional Switching in Strontium Titanate Flexible Resistive Memories. ACS APPLIED MATERIALS & INTERFACES 2020; 12:7326-7333. [PMID: 31976656 DOI: 10.1021/acsami.9b20585] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Multifunctional electronic memories capable of demonstrating both analog and digital switching on-demand are extremely attractive for miniaturization of electronics without significant drain on energy consumption. Simultaneously translating functionality onto mechanically conformable platforms will further enhance their suitability. Here, we demonstrate the ability to engineer multifunctionality in strontium titanate (STO)-based resistive random-access memories (ReRAM) on a flexible polyimide platform. By utilizing different bottom electrodes of various work functions while the top electrode is fixed, differential work functions are induced in STO, to induce bipolar or complementary switching behaviors whenever required. This work-function difference-induced bifunctional switching on the flexible platform reveals a streamlined route for achieving flexible artificial neural networks, high density integration, and logic operation using a single ReRAM.
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Affiliation(s)
- Md Ataur Rahman
- Functional Materials and Microsystems Research Group and the Micro Nano Research Facility , RMIT University , Melbourne , Victoria 3001 , Australia
| | | | - Taimur Ahmed
- Functional Materials and Microsystems Research Group and the Micro Nano Research Facility , RMIT University , Melbourne , Victoria 3001 , Australia
| | - Michelle J S Spencer
- School of Science , RMIT University , GPO Box 2476, Melbourne , Victoria 3001 , Australia
| | - Sumeet Walia
- Functional Materials and Microsystems Research Group and the Micro Nano Research Facility , RMIT University , Melbourne , Victoria 3001 , Australia
| | - Sharath Sriram
- Functional Materials and Microsystems Research Group and the Micro Nano Research Facility , RMIT University , Melbourne , Victoria 3001 , Australia
| | - Madhu Bhaskaran
- Functional Materials and Microsystems Research Group and the Micro Nano Research Facility , RMIT University , Melbourne , Victoria 3001 , Australia
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Ahmed T, Walia S, Mayes ELH, Ramanathan R, Bansal V, Bhaskaran M, Sriram S, Kavehei O. Time and rate dependent synaptic learning in neuro-mimicking resistive memories. Sci Rep 2019; 9:15404. [PMID: 31659247 PMCID: PMC6817848 DOI: 10.1038/s41598-019-51700-0] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2019] [Accepted: 10/01/2019] [Indexed: 12/27/2022] Open
Abstract
Memristors have demonstrated immense potential as building blocks in future adaptive neuromorphic architectures. Recently, there has been focus on emulating specific synaptic functions of the mammalian nervous system by either tailoring the functional oxides or engineering the external programming hardware. However, high device-to-device variability in memristors induced by the electroforming process and complicated programming hardware are among the key challenges that hinder achieving biomimetic neuromorphic networks. Here, a simple hybrid complementary metal oxide semiconductor (CMOS)-memristor approach is reported to implement different synaptic learning rules by utilizing a CMOS-compatible memristor based on oxygen-deficient SrTiO3-x (STOx). The potential of such hybrid CMOS-memristor approach is demonstrated by successfully imitating time-dependent (pair and triplet spike-time-dependent-plasticity) and rate-dependent (Bienenstosk-Cooper-Munro) synaptic learning rules. Experimental results are benchmarked against in-vitro measurements from hippocampal and visual cortices with good agreement. The scalability of synaptic devices and their programming through a CMOS drive circuitry elaborates the potential of such an approach in realizing adaptive neuromorphic computation and networks.
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Affiliation(s)
- Taimur Ahmed
- Functional Materials and Microsystems Research Group and Micro Nano Research Facility, RMIT University, Melbourne, VIC, 3001, Australia.
- Functional Materials and Microsystems Research Group and Micro Nano Research Facility, RMIT University, Melbourne, VIC, 3001, Australia.
| | - Sumeet Walia
- Functional Materials and Microsystems Research Group and Micro Nano Research Facility, RMIT University, Melbourne, VIC, 3001, Australia
- Functional Materials and Microsystems Research Group and Micro Nano Research Facility, RMIT University, Melbourne, VIC, 3001, Australia
| | - Edwin L H Mayes
- RMIT Microscopy and Microanalysis Facility, RMIT University, Melbourne, VIC, 3001, Australia
| | - Rajesh Ramanathan
- Sir Ian Potter NanoBioSensing Facility, NanoBiotechnology Research Laboratory, School of Science, RMIT University, Melbourne, VIC, 3001, Australia
| | - Vipul Bansal
- Sir Ian Potter NanoBioSensing Facility, NanoBiotechnology Research Laboratory, School of Science, RMIT University, Melbourne, VIC, 3001, Australia
| | - Madhu Bhaskaran
- Functional Materials and Microsystems Research Group and Micro Nano Research Facility, RMIT University, Melbourne, VIC, 3001, Australia
- Functional Materials and Microsystems Research Group and Micro Nano Research Facility, RMIT University, Melbourne, VIC, 3001, Australia
| | - Sharath Sriram
- Functional Materials and Microsystems Research Group and Micro Nano Research Facility, RMIT University, Melbourne, VIC, 3001, Australia.
- Functional Materials and Microsystems Research Group and Micro Nano Research Facility, RMIT University, Melbourne, VIC, 3001, Australia.
| | - Omid Kavehei
- Functional Materials and Microsystems Research Group and Micro Nano Research Facility, RMIT University, Melbourne, VIC, 3001, Australia.
- Functional Materials and Microsystems Research Group and Micro Nano Research Facility, RMIT University, Melbourne, VIC, 3001, Australia.
- Faculty of Engineering, The University of Sydney, NWS, 2006, Sydney, Australia.
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