Exchange biased Anomalous Hall Effect driven by frustration in a magnetic Kagome lattice

ORAL

Abstract

Co3Sn2S2 is a ferromagnetic Weyl semimetal that has been the subject of intense scientific interest due to its large anomalous Hall effect (AHE). We show that the coupling of this material's topological properties to its magnetic texture leads to a strongly exchange biased AHE, and argue that this is likely caused by coexistence of ferromagnetism and spin glass phases. The spin glass is being driven not by disorder, but by the geometric frustration intrinsic to the Kagome network of magnetic ions. Both phases are thought to originate from the Co spin system, in an interesting display of Exchange Bias eminating from a single magnetic phase. Magnetism plays an important role in the robustness of the QAHE in magnetically doped topological insulators, and may play a crucial role in unlocking the possibility of a QAHE in low-dimensional structures of Co3Sn2S2.
arXiv:1907.06651

*This work was supported by the National Science Foundation under Grant No. 1607753 and DGE-1106400, The Gordon and Betty Moore foundations EPiQS Initiative - Grant GBMF4374. NHMFL is supported by National Science Foundation Cooperative Agreement No. DMR-1157490 and the State of Florida. E.L is an Awardee of the Weizmann Institute of Science - National Postdoctoral Award Program for Advancing Women in Science.

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Presenters

  • Ella Lachman

    • University of California, Berkeley

Authors

  • Ella Lachman

    • University of California, Berkeley

  • Ryan Murphy

    • University of California, Berkeley

  • Nikola Maksimovic

    • Department of Physics, University of California, Berkeley
    • University of California, Berkeley

  • Robert Kealhofer

    • Physics, University of California, Berkeley
    • University of California, Berkeley

  • Shannon C Haley

    • Physics, New York Univ NYU
    • University of California, Berkeley

  • Ross McDonald

    • Los Alamos National Laboratory
    • physics, los alamos national lab
    • NHMFL-PFF, Los Alamos National Laboratory
    • Los Alamos Natl. Lab
    • Los Alamos Natl Lab
    • National High Magnetic Field Laboratory, LANL

  • Jeffrey R Long

    • Chemistry, University of California, Berkeley
    • University of California, Berkeley
    • Lawrence Berkeley National Laboratory

  • James Analytis

    • University of California, Berkeley
    • Department of Physics, University of California, Berkeley
    • Physics, University of California Berkeley
    • Physics, University of California Berkerley
    • Physics, University of California, Berkeley
    • physics, University of California, Berkeley