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Role of Ferromagnetic Monolayer WSe2 Flakes in the Pt/Y3Fe5O12 Bilayer Structure in the Longitudinal Spin Seebeck Effect

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Abstract
In this paper, we demonstrate that with a monolayer tungsten diselenide (ML WSe2) interlayer in the Pt/YIG bilayer system, the longitudinal SSE (LSSE) voltage is significantly increased by the increased spin accumulation in the Pt layer; the spin fluctuation in ML WSe2 amplifies the spin current transmission because the in-plane-aligned WSe2 spins are coupled to thermally pumped spins under nonequilibrium magnetization conditions in the LSSE configuration at room temperature. The thermopower (VLSSE/ΔT) improves by 323% with respect to the value of the reference Pt/YIG bilayer samp le in the LSSE at room temperature. In addition, the induced ferromagnetic properties of the ML WSe2 flakes on YIG increase the LSSE voltage (VLSSE) of the sample; the ferromagnetic properties are a result of the improved magnetic moment density in the ML WSe2 flakes and their two-dimensional (2D) ML nature in the LSSE under nonequilibrium magnetization conditions. The results can extend the application range of the materials in energy harvesting and provide important information on the physics of the LSSE with a transition metal dichalcogenide intermediate layer in spin transport.
Author(s)
이원용강민성김길성박노원레친탐최광영라시드 마문 우르Saitoh Eiji김용수이상권
Issued Date
2021
Type
Article
Keyword
SurfacesInterfacesand Applications
DOI
10.1021/acsami.0c22345
URI
https://oak.ulsan.ac.kr/handle/2021.oak/9506
https://ulsan-primo.hosted.exlibrisgroup.com/primo-explore/fulldisplay?docid=TN_cdi_proquest_miscellaneous_2506277071&context=PC&vid=ULSAN&lang=ko_KR&search_scope=default_scope&adaptor=primo_central_multiple_fe&tab=default_tab&query=any,contains,Role%20of%20Ferromagnetic%20Monolayer%20WSe2%20Flakes%20in%20the%20Pt%2FY3Fe5O12%20Bilayer%20Structure%20in%20the%20Longitudinal%20Spin%20Seebeck%20Effect&offset=0&pcAvailability=true
Publisher
ACS Applied Materials & Interfaces
Location
미국
Language
영어
ISSN
1944-8244
Citation Volume
13
Citation Number
13
Citation Start Page
15783
Citation End Page
15790
Appears in Collections:
Natural Science > Physics
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