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Radiative Thermal Memristor.

Jose Ordonez-Miranda1, Younès Ezzahri1, Jose A Tiburcio-Moreno2

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Researchers developed a radiative thermal memristor using phase change materials. This device shows potential for thermal computing by mimicking electrical memristors with heat flux and temperature variations.

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Area of Science:

  • Thermodynamics
  • Materials Science
  • Photonics

Background:

  • Phase change materials exhibit thermal hysteresis, a property useful for memory applications.
  • Radiative heat exchange is a fundamental thermodynamic process.
  • Memristors are electronic components with memory properties.

Purpose of the Study:

  • To propose and characterize a novel radiative thermal memristor.
  • To explore the use of thermal hysteresis in phase change materials for memristive behavior.
  • To lay the groundwork for thermal computing using photons.

Main Methods:

  • Utilizing the thermal hysteresis of a phase change material (VO2) in radiative heat exchange with a phase-invariable material (blackbody).
  • Analyzing the Lissajous curve between exchanged heat flux and temperature difference under periodic modulation.
  • Investigating the temperature dependence of memristance and the on-off ratio.

Main Results:

  • A radiative thermal memristor was successfully proposed, exhibiting a Lissajous curve.
  • The memristance followed a closed loop dictated by VO2's thermal hysteresis width.
  • An on-off ratio of 3.6 was achieved, based on VO2's emissivity contrast.

Conclusions:

  • The proposed radiative thermal memristor demonstrates memristive characteristics analogous to electrical counterparts.
  • This work provides a foundation for developing thermal computing systems utilizing photons.
  • The device leverages the unique properties of phase change materials for novel functionalities.