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Memory is categorized into three major systems: sensory memory, short-term memory (STM), and long-term memory (LTM). These systems differ in their capacity and the duration for which they can hold information. Sensory memory captures raw sensory input from the environment, holding it for just a few seconds or less. For example, on hearing a brief, loud sound, like a car horn honking, the sound seems to linger in the mind for a moment even after it stops. This is an instance of sensory memory...
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Working memory refers to a combination of components, including short-term memory and attention, that allow an individual to hold information temporarily as we perform cognitive tasks. It is an essential cognitive function that enables the execution of complex tasks such as problem-solving, comprehension, and reasoning. Unlike short-term memory, which simply involves the storage of information for a brief period, working memory involves the active manipulation and processing of this...
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Long-term memory is a relatively permanent type of memory, capable of storing vast amounts of information over extended periods. Its storage capacity is generally considered unlimited.
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Related Experiment Video

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A Real-world What-Where-When Memory Test
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Thinnest Nonvolatile Memory Based on Monolayer h-BN.

Xiaohan Wu1, Ruijing Ge1, Po-An Chen1,2

  • 1Microelectronics Research Center, University of Texas at Austin, Austin, TX, 78758, USA.

Advanced Materials (Deerfield Beach, Fla.)
|February 19, 2019
PubMed
Summary

Monolayer hexagonal boron nitride (h-BN) exhibits nonvolatile resistance switching (NVRS), enabling record-thin atomristors. This 2D insulator demonstrates forming-free switching, advancing ultrathin memory technologies.

Keywords:
2D materialsatomristorhexagonal boron nitridememristornonvolatile resistance switching

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Area of Science:

  • Materials Science
  • Nanoelectronics
  • Solid-State Physics

Background:

  • Two-dimensional (2D) materials are crucial for nanoelectronics.
  • Previous research suggested atomically thin layered materials couldn't achieve memristive effects in vertical structures.
  • Monolayer transition metal dichalcogenide (TMD) atomristors recently overcame sub-nanometer scaling limits.

Purpose of the Study:

  • To report the nonvolatile resistance switching (NVRS) phenomenon in monolayer hexagonal boron nitride (h-BN).
  • To investigate h-BN atomristors for potential applications in next-generation electronic devices.
  • To explore the underlying mechanism of resistance switching in 2D insulators.

Main Methods:

  • Fabrication and characterization of monolayer h-BN atomristors with various electrodes.
  • Electrical testing of NVRS in unipolar and bipolar operations.
  • Ab-initio simulations to elucidate the switching mechanism.

Main Results:

  • Monolayer h-BN exhibits forming-free NVRS with a large on/off ratio (up to 10^7).
  • Fast switching speeds (<15 ns) were achieved via pulse operation.
  • h-BN atomristors achieved a record thickness of ≈0.33 nm, surpassing monolayer TMDs.
  • Simulations suggest metal ion substitution into h-BN vacancies drives the switching.

Conclusions:

  • Monolayer h-BN is a viable 2D insulator for nonvolatile memory applications.
  • The NVRS phenomenon in h-BN arises from defect, metal ion, and interface interactions.
  • These findings pave the way for ultrathin flexible memory, printed electronics, neuromorphic computing, and RF switches.