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

*This work is supported by NSF award DMR2002651 and the Penn State MRSEC Center for Nanoscale Science via NSF award DMR2011839.

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