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A superconductor is a substance that offers zero resistance to the electric current when it drops below a critical temperature. Zero resistance is not the only interesting phenomenon as materials reach their transition temperatures. A second effect is the exclusion of magnetic fields. This is known as the Meissner effect. A light, permanent magnet placed over a superconducting sample will levitate in a stable position above the superconductor. High-speed trains that levitate on strong...
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Asymmetric Thermoelectrochemical Cell for Harvesting Low-grade Heat under Isothermal Operation
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Published on: February 5, 2020

Graphene-based spin caloritronics.

Minggang Zeng1, Yuanping Feng, Gengchiau Liang

  • 1Department of Electrical and Computer Engineering, 4 Engineering Drive 3, National University of Singapore, Singapore 117576, Republic of Singapore.

Nano Letters
|February 25, 2011
PubMed
Summary
This summary is machine-generated.

This study explores thermal spin transport in magnetized zigzag graphene nanoribbons (M-ZGNRs). Applying a temperature difference induces opposite spin currents, demonstrating potential for graphene-based spin caloritronic devices.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Spintronics

Background:

  • Graphene nanoribbons (GNRs) exhibit unique electronic properties.
  • Spin caloritronics explores the interplay of spin, charge, and heat transport.
  • Magnetized zigzag graphene nanoribbons (M-ZGNRs) offer potential for novel spin functionalities.

Purpose of the Study:

  • To investigate thermally induced spin transport in M-ZGNRs.
  • To understand the underlying mechanisms of the spin Seebeck effect in these systems.
  • To explore the tunability of spin currents and thermal magnetoresistance.

Main Methods:

  • First-principles calculations were employed.
  • A temperature difference was applied across M-ZGNR devices.
  • Back gate voltage was used for modulation.

Main Results:

  • Thermally induced spin-up and spin-down currents were observed flowing in opposite directions.
  • The spin Seebeck effect was attributed to asymmetric electron-hole transmission spectra.
  • Spin currents were tunable and fully polarizable via back gate voltage.
  • High thermal magnetoresistance (up to 10(4)%) was achieved without external bias.

Conclusions:

  • M-ZGNRs exhibit significant spin Seebeck effect.
  • Gate voltage provides effective control over spin currents.
  • High thermal magnetoresistance suggests potential for passive spin caloritronic applications.
  • Results pave the way for graphene-based spin caloritronic devices.