Adam Christensen

Multifunctional electrochemical memory stabilized by phase coexistence

Sangheon Oh, Adam L. Gross, Adam Christensen, Jacklyn Zhu et autres

Our growing computing needs, especially in applications that heavily rely on artificial intelligence (AI), motivate a search for new components that could substantially augment the performance of general-purpose digital computers. Beyond ON/OFF switching, new components with linear multistate analog resistive tuning, nonlinear …

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Electrochemical transformation of phases on vanadium oxide for reconfigurable computing

Sangheon Oh, Adam L. Gross, Adam Christensen, Sritharini Radhakrishnan et autres

Electrochemical Transformation of Phases on Vanadium Oxide for Reconfigurable Computing

Sandia National Laboratories (SNL-CA), Livermore, CA (United States), Sangheon Oh, Basic Energy Sciences, Adam L. Gross et autres

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Fabrication and Characterization of Thin Film Devices for Use in Neuromorphic Computing

Adam Christensen

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Vanadium Oxide Device with Tunable Oxygen Vacancy Concentration for Neuromorphic Computing

Patrick Sean Finnegan, Sangheon Oh, Brian T. Zutter, Sean R. Bishop et autres

Analog, non-volatile memories that can enable in-memory data processing are attractive for exploring non-von-Neumann architectures to realize substantially more efficient computing for AI applications. Among the various device concepts, NVMs based on tuning of point defects via insertion of ions such as …

Vanadium oxide device with tunable oxygen vacancy concentration for neuromorphic computing

Patrick Sean Finnegan, Sangheon Oh, Adam Christensen, Sean R. Bishop et autres

A vanadium-oxygen phase diagram.Highlighted parts represent the single-phase regions.

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Publisher’s Note: “Electro-optic effect in thin film strontium barium niobate (SBN) grown by RF magnetron sputtering on SrTiO3 substrates” [J. Appl. Phys. 136, 013102 (2024)]

Adam Christensen, Marc Reynaud, Agham B. Posadas, Xun Zhan et autres

This is a correction to: Electro-optic effect in thin film strontium barium niobate (SBN) grown by RF magnetron sputtering on SrTiO 3 substrates Articles You May Be Interested InOrigin of non-absorptive scattering loss in Si-integrated barium titanate

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Electro-optic effect in thin film strontium barium niobate (SBN) grown by RF magnetron sputtering on SrTiO3 substrates

Adam Christensen, Marc Reynaud, Agham B. Posadas, Xun Zhan et autres

Ferroelectric strontium barium niobate (SrxBa1−xNb2O6 or SBN) is a material with high electro-optic (EO) response. It is currently of interest in low voltage silicon-integrated photonics (SiPh). We have grown strongly textured SBN films with x = 0.65 by radio frequency sputtering on …

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Understanding and Manipulating Electronic Noise in Electrochemical Random Access Memory for Neuromorphic Computing

Sangheon Oh, T. Patrick Xiao, Christopher R. Bennett, Patrick Sean Finnegan et autres

Brain inspired in-memory computing using networks of analog non-volatile memory (NVM) elements has emerged as a promising, more energy efficient alternative to digital computing for data intensive applications [1] . Since information processing is performed in the analog domain, control of electrical …

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Effect of substrate and growth method on vanadium dioxide thin films by RF magnetron sputtering: Vanadium metal oxidation vs reactive sputtering

Adam Christensen, Agham B. Posadas, Brian T. Zutter, Patrick Sean Finnegan et autres

Vanadium dioxide (VO2) undergoes a metal–insulator phase transition at ∼70 °C and has attracted substantial interest for potential applications in electronics, including those in neuromorphic computing. The vanadium–oxygen system has a rather complicated phase diagram, and controlling the stoichiometry and the phase …

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VO2 Thin Film Growth by RF Magnetron Sputtering on YSZ Substrate.

Adam Christensen, Agham B. Posadas, Albert Alec Talin, Alex Demkov

Abstract not provided.

Facile growth of epitaxial vanadium monoxide on SrTiO3 via substrate oxygen scavenging

Agham B. Posadas, Sunah Kwon, Adam Christensen, Moon Jae Kim et autres

The deposition of vanadium metal on SrTiO3 results in the spontaneous scavenging of oxygen ions from SrTiO3 to oxidize vanadium to VOx, where x = 0.3–1.1, depending on the deposition temperature. At temperatures above 700 °C, an epitaxial film of the rock …

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