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Near-room-temperature spin caloritronics in a magnetized and defective zigzag MoS2 nanoribbon

Zakerian, F ; Sharif University of Technology | 2020

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  1. Type of Document: Article
  2. DOI: 10.1007/s10825-019-01406-3
  3. Publisher: Springer , 2020
  4. Abstract:
  5. Using a tight-binding approach and first-principles calculations combined with the nonequilibrium Green’s function method, the thermal spin transport in a zigzag molybdenum disulfide (MoS 2) nanoribbon in the proximity of a ferromagnetic insulator that induces a local exchange magnetic field in the center of the nanoribbon is investigated. It is found that a pure spin current and perfect spin Seebeck effect with zero charge current can be generated by applying a thermal gradient and local exchange magnetic field without a bias voltage near room temperature. Furthermore, it is shown that this nanoscale device can act as a spin Seebeck diode for the control of thermal and spin information in spin caloritronics applications. Finally, the impact of structural defects including edge and Stone–Wales defects on the spin figure of merit is studied. It is then shown that the spin figure of merit can be higher for a magnetized and defective MoS 2 nanoribbon. The results of this work facilitate deep understanding of the effects of structural defects on the thermoelectric properties of MoS 2 nanoribbons and indicate their great potential for use in spin caloritronics devices for operation at room temperature. © 2019, Springer Science+Business Media, LLC, part of Springer Nature
  6. Keywords:
  7. MoS 2 nanoribbon ; Nonequilibrium Green’s function ; Spin Seebeck effect ; Stone–Wales (SW) defects ; Calculations ; Defects ; Layered semiconductors ; Magnetic fields ; Nanoribbons ; Sulfur compounds ; Ferromagnetic insulator ; First-principles calculation ; MoS2 nanoribbon ; Near room temperature ; S function ; Spin caloritronics ; Thermoelectric properties ; Tight-binding approaches ; Molybdenum compounds
  8. Source: Journal of Computational Electronics ; Volume 19, Issue 1 , 2020 , Pages 137-146
  9. URL: https://link.springer.com/article/10.1007/s10825-019-01406-3