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Charge to spin conversion in atomically thin lead and bismuth

ORAL

Abstract

We report evidence of charge to spin conversion in atomically thin Pb and Bi encapsulated within a silicon carbide substrate and an epitaxial graphene top layer prepared using confinement heteroepitaxy (CHet) [1]. We combine these samples with the soft ferromagnet permalloy (NiFe) and use spin torque ferromagnetic resonance to study the charge to spin conversion phenomenon in the NiFe/graphene/2D metal heterostructure. We perform angle dependent measurements to study the symmetry of the torques over the magnetization generated due to spin in the heterostructure and compare our results with a NiFe/graphene control sample. Finally, we combine our measurements with first principles calculations and a realistic tight binding model that show the presence of a Rashba type spin texture in monolayer lead [2].

[1] Briggs, N., et al. Nat. Mater. 19, 637–643. (2020).

[2] Vera, A., et al. arXiv (2022). https://arxiv.org/abs/2205.06859

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Publication: Vera, A., et al. arXiv (2022). https://arxiv.org/abs/2205.06859<br>Yang, K., Wang, Y., Liu, C., Phys. Rev. Lett. 128, 166601. (2022).

Presenters

  • Wilson J Yanez

    Pennsylvania State University

Authors

  • Wilson J Yanez

    Pennsylvania State University

  • Alexander Vera

    Pennsylvania State University

  • Kaijie Yang

    Pennsylvania State University

  • Boyang Zheng

    Pennsylvania State University

  • Chengye Dong

    Department of Materials Science and Engineering, Pennsylvania State University, Pennsylvania State University, Penn State University

  • Yuanxi Wang

    Pennsylvania State University

  • Timothy Bowen

    Pennsylvania State University

  • Hesham El-Sherif

    McMaster University

  • Gopi Krishnan

    Pennsylvania State University, McMaster University

  • Siavash Rajabpour

    Pennsylvania State University

  • Maxwell Wetherington

    Penn State University, Pennsylvania State University

  • Roland Koch

    Lawrence Berkeley National Labs, Lawrence Berkeley National Lab, Lawrence Berkeley National Laboratory

  • Eli Rotenberg

    Lawrence Berkeley National Laboratory, Advanced Light Source, Lawrence Berkeley National Lab

  • Nabil Bassim

    McMaster University

  • Vincent H Crespi

    Pennsylvania State University

  • Chaoxing Liu

    Pennsylvania State University, Department of Physics, The Pennsylvania State University, University Park, Pennsylvania 16802, USA, Department of Physics, The Pennsylvania State University

  • Joshua A Robinson

    Pennsylvania State University

  • Nitin Samarth

    Pennsylvania State University, The Pennsylvania State University