journal article·2024-10-02Open access

Unraveling the Spin-to-Charge Current Conversion Mechanism and Charge Transfer Dynamics at the Interface of Graphene/WS2 Heterostructures at Room Temperature

Rafael O. Cunha, Yunier Garcia-Basabe, Dunieskys G. Larrude, Matheus Gamino, Erika N. Lima, Felipe Crasto de Lima, Adalberto Fazzio, Sergio M. Rezende, Antonio Azevedo, Joaquim B. S. Mendes

Abstract

High Resolution Image Download MS PowerPoint Slide We report experimental investigations of spin-to-charge current conversion and charge transfer (CT) dynamics at the interface of the graphene/WS 2 van der Waals heterostructure. Pure spin current was produced by the spin precession in the microwave-driven ferromagnetic resonance of a permalloy film (Py=Ni 81 Fe 19 ) and injected into the graphene/WS 2 heterostructure through a spin pumping process. The observed spin-to-charge current conversion in the heterostructure is attributed to the inverse Rashba–Edelstein effect (IREE) at the graphene/WS 2 interface. Interfacial CT dynamics in this heterostructure was investigated based on the framework of the core-hole clock (CHC) approach. The results obtained from spin pumping and CHC studies show that the spin-to-charge current conversion and charge transfer processes are more efficient in the graphene/WS 2 heterostructure compared to isolated WS 2 and graphene films. The results show that the presence of WS 2 flakes improves the current conversion efficiency. These experimental results are corroborated by density functional theory (DFT) calculations, which reveal (i) Rashba spin–orbit splitting of graphene orbitals and (ii) electronic coupling between graphene and WS 2 orbitals. This study provides valuable insights for optimizing the design and performance of spintronic devices.
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Research context

OpenAlex topics: Advanced Memory and Neural Computing · 2D Materials and Applications · Quantum and electron transport phenomena

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Departamento de Física, Universidade Federal de Viçosa, Viçosa 36570-900, Minas Gerais, Brazil

Centro Interdisciplinar de Ciências da Natureza, Universidade Federal da Integração Latino-Americana, Foz do Iguaçu 85867-970, Paraná, Brazil

Escola de Engenharia, Universidade Presbiteriana Mackenzie, São Paulo 01302-907, Brazil

Departamento de Física, Universidade Federal do Rio Grande do Norte, Natal 59078-900, Rio Grande do Norte, Brazil

Instituto de Física, Universidade Federal de Mato Grosso, 78060-900 Cuiabá, Mato Grosso, Brazil

Ilum School of Science, Brazilian Center for Research in Energy and Materials (CNPEM), 13083-970 Campinas, São Paulo, Brazil

Departamento de Física, Universidade Federal de Pernambuco, 50670-901 Recife, Pernambuco, Brazil

Funding

Funda??o de Amparo ? Pesquisa do Estado de Minas Gerais · Funda??o de Amparo ? Ci?ncia e Tecnologia do Estado de Pernambuco · Universidade Federal de Pernambuco · Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico · Instituto de Ci?ncia e Tecnologia de Nanomateriais de Carbono · Funda??o de Amparo ? Pesquisa do Estado de S?o Paulo · Financiadora de Estudos e Projetos · Centro Nacional de Processamento de Alto Desempenho em S?o Paulo · Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior · Instituto Nacional de Ci?ncia e Tecnologia de Spintr?nica e Nanoestruturas Magn?ticas Avan?adas

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