Unraveling the Spin-to-Charge Current Conversion Mechanism and Charge Transfer Dynamics at the Interface of Graphene/WS<sub>2</sub> Heterostructures at Room Temperature
We report experimental investigations of spin-to-charge current conversion and charge transfer (CT) dynamics at the interface of the graphene/WS<sub>2</sub> 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<sub>81</sub>Fe<sub>19</sub>) and injected into the graphene/WS<sub>2</sub> 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<sub>2</sub> 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<sub>2</sub> heterostructure compared to isolated WS<sub>2</sub> and graphene films. The results show that the presence of WS<sub>2</sub> 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<sub>2</sub> orbitals. This study provides valuable insights for optimizing the design and performance of spintronic devices.
Authors
- F. Crasto de Lima (ORCID: https://orcid.org/0000-0002-2937-2620)
- A. Azevedo (ORCID: https://orcid.org/0000-0001-8572-9877)
- J. B. S. Mendes (ORCID: https://orcid.org/0000-0001-9381-0448)
- A. Fazzio (ORCID: https://orcid.org/0000-0001-5384-7676)
- R. O. Cunha (ORCID: https://orcid.org/0000-0002-6039-3892)
- Yunier Garcia‐Basabe (ORCID: https://orcid.org/0000-0001-5683-0108)
- S. M. Rezende (ORCID: https://orcid.org/0000-0002-3806-411X)
- M. Gamino (ORCID: https://orcid.org/0000-0002-0420-7258)
- Dunieskys G. Larrudé (ORCID: https://orcid.org/0000-0001-8126-5876)
- Erika N. Lima (ORCID: https://orcid.org/0000-0002-0670-9737)
Institutions
- Universidade Federal de Viçosa (BR)
- Universidade Federal da Integração Latino-Americana (BR)
- Universidade Presbiteriana Mackenzie (BR)
- Universidade Federal de Pernambuco (BR)
- Universidade Federal de Mato Grosso (BR)
- Universidade Federal do Rio Grande do Norte (BR)
- Brazilian Center for Research in Energy and Materials (BR)
Publication Details
- Journal
- ACS Applied Materials & Interfaces
- Published
- 2024-10-02
- DOI
- https://doi.org/10.1021/acsami.4c08539
- Citations
- 6
- Primary Topic
- Advanced Memory and Neural Computing
- Type
- article
- Field-Weighted Citation Impact
- 1.25
Funders
- Fundação de Amparo à Pesquisa do Estado de São Paulo
- Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
- Conselho Nacional de Desenvolvimento Científico e Tecnológico
- Financiadora de Estudos e Projetos
- Fundação de Amparo à Pesquisa do Estado de Minas Gerais
- Fundação de Amparo à Ciência e Tecnologia do Estado de Pernambuco
- Universidade Presbiteriana Mackenzie
- Universidade Federal de Pernambuco
- Universidade Federal do Rio Grande do Norte
- Centro Nacional de Processamento de Alto Desempenho em São Paulo
- Centro Nacional de Pesquisa em Energia e Materiais
- Instituto de Ciência e Tecnologia de Nanomateriais de Carbono