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journal article·2024-01-23Open access

Infrared Nanoimaging of Hydrogenated Perovskite Nickelate Memristive Devices

Sampath Gamage, Sukriti Manna, Marc Zajac, Steven Hancock, Qi Wang, Sarabpreet Singh, Mahdi Ghafariasl, Kun Yao, Tom E. Tiwald, Tae Joon Park, David P. Landau, Haidan Wen, Subramanian K. R. S. Sankaranarayanan, Pierre Darancet, Shriram Ramanathan, Yohannes Abate

ACS Nano· Volume 18· Issue 3
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Abstract

High Resolution Image Download MS PowerPoint Slide Solid-state devices made from correlated oxides, such as perovskite nickelates, are promising for neuromorphic computing by mimicking biological synaptic function. However, comprehending dopant action at the nanoscale poses a formidable challenge to understanding the elementary mechanisms involved. Here, we perform operando infrared nanoimaging of hydrogen-doped correlated perovskite, neodymium nickel oxide (H-NdNiO 3, H-NNO), devices and reveal how an applied field perturbs dopant distribution at the nanoscale. This perturbation leads to stripe phases of varying conductivity perpendicular to the applied field, which define the macroscale electrical characteristics of the devices. Hyperspectral nano-FTIR imaging in conjunction with density functional theory calculations unveils a real-space map of multiple vibrational states of H-NNO associated with OH stretching modes and their dependence on the dopant concentration. Moreover, the localization of excess charges induces an out-of-plane lattice expansion in NNO which was confirmed by in situ X-ray diffraction and creates a strain that acts as a barrier against further diffusion. Our results and the techniques presented here hold great potential for the rapidly growing field of memristors and neuromorphic devices wherein nanoscale ion motion is fundamentally responsible for function.
Source: openalex_inverted_index · Quality: baseline

Research context

NanomaterialsElectronic materials

OpenAlex topics: Advanced Memory and Neural Computing · Perovskite Materials and Applications · Transition Metal Oxide Nanomaterials

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Department of Physics and Astronomy, University of Georgia, Athens, Georgia 30602, United States

Center for Nanoscale Materials, Argonne National Laboratory, Lemont, Illinois 60439, United States

Department of Mechanical and Industrial Engineering, University of Illinois, Chicago, Illinois 60607, United States

Advanced Photon Source, Argonne National Laboratory, Lemont, Illinois 60439, United States

Center for Simulational Physics and Department of Physics and Astronomy, University of Georgia, Athens, Georgia 30602, United States

School of Materials Engineering, Purdue University, West Lafayette, Indiana 47907, United States

School of Electrical and Computer Engineering, University of Georgia, Athens, Georgia 30602, United States

J.A. Woollam Co., Inc., Lincoln, Nebraska 68508, United States

Materials Science Division, Argonne National Laboratory, Lemont, Illinois 60439, United States

Northwestern Argonne Institute of Science and Engineering, Evanston, Illinois 60208, United States

Department of Electrical & Computer Engineering, Rutgers, The State University of New Jersey, Piscataway, New Jersey 08854, United States

Funding

Energy Frontier Research Centers · Gordon and Betty Moore Foundation · Division of Graduate Education · Air Force Office of Scientific Research · National Science Foundation

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