4.8 Article

Enhanced Spin Seebeck Thermopower in Pt/Holey MoS2/Y3Fe5O12 Hybrid Structure

Journal

NANO LETTERS
Volume 21, Issue 1, Pages 189-196

Publisher

AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.0c03499

Keywords

molybdenum disulfide; Rashba-Edelstein effect; longitudinal spin Seebeck effect; spin accumulation; spin-to-charge conversion

Funding

  1. National Research Foundation of Korea (NRF) - Korean government (MIST) [2020R1A2C1004979, 2020R1A5A1016518]
  2. National Research Foundation of Korea [2020R1A5A1016518, 2020R1A2C1004979] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)

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The spin-to-charge conversion in holey MoS2 interlayers can enhance the LSSE performance, representing a significant achievement in understanding spin transport in atomically thin MoS2 interlayers.
We first observed the spin-to-charge conversion due to both the inverse Rashba-Edelstein effect (IREE) and inverse spin-Hall effect in a holey multilayer molybdenum disulfide (MoS2) intermediate layer in a Pt/YIG structure via LSSE measurements under nonequilibrium magnetization. We found an enhancement of approximately 238%, 307%, and 290% in the longitudinal spin Seebeck effect (LSSE) voltage, spin-to-charge current, and thermoelectric (TE) power factor, respectively, compared with the monolayer MoS2 interlayer in a Pt/YIG structure. Such an enhancement in the LSSE performance of Pt/holey MoS2/YIG can be explained by the improvement of spin accumulation in the Pt layer by induced spin fluctuation as well as increased additional spin-to-charge conversion due to in-plane IREE. Our findings represent a significant achievement in the understanding of spin transport in atomically thin MoS2 interlayers and pave the way toward large-area TE energy-harvesting devices in two-dimensional transition metal dichalcogenide materials.

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