Investigation of spin pumping across FeGaB – BiSb interface at two different time scales

ORAL

Abstract

3-D topological insulators (TI) with large spin Hall conductivity have emerged as potential candidates for spintronic applications [1]. Here, we report spin to charge conversion in bilayers of amorphous ferromagnet (FM) Fe78Ga13B9 (FeGaB) and 3-D TI Bi85Sb15 (BiSb) activated by two complementary techniques: spin pumping and ultrafast spin-current injection. The spin pumping parameters derived from inverse spin Hall effect measurements are consistent with the results of femtosecond light-pulse induced THz emission, successfully verified using theoretical calculations of spin Hall conductivity of BiSb thin films based on tight binding model. Our results suggest that these first-time measurements and theory of spin dynamics from ~ 10 GHz to several THz in a simple but novel and scalable TI-FM interface provide a promising platform for creating novel spin orbit torque devices.

[1] Hasan, et al. Annu. Rev. Condens. Matter Phys. 2.1 (2011): 55-78.

*This research at Morgan State is supported by the Air Force Office of Scientific Research, Grant # FA9550-19-1-0082. Terahertz measurements conducted at Delaware were supported by NSF through the University of Delaware Materials Research Science and Engineering Center DMR-2011824.

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Publication: This work has been submitted in Physical Review Materials.

Presenters

  • vinay Sharma

    • Morgan State University
    • morgan state university

Authors

  • vinay Sharma

    • Morgan State University
    • morgan state university

  • Weipeng Wu

    • University of Delaware

  • Prabesh Bajracharya

    • Morgan State University

  • Quang To

    • University Of Delaware
    • University of Delaware

  • Anthony Johnson

    • Morgan State University
    • morgan state university

  • Anderson Janotti

    • University of Delaware
    • Department of Materials Science & Engineering, University of Delaware

  • Garnett W Bryant

    • National Institute of Standards and Technology
    • National Institute of Standards and Tech
    • National Institute of Standards and Technology, JQI

  • Lars Gundlach

    • University of Delaware

  • Matthias Benjamin Jungfleisch

    • University of Delaware
    • Department of Physics and Astronomy, University of Delaware, Newark, DE 19716, United States

  • Ramesh C Budhani

    • Morgan State University
    • morgan state university