Colossal Anomalous Hall effect in a noncoplanar antiferromagnet

ORAL

Abstract



The intriguing interplay between complex magnetism and charge transport in noncoplanar magnetic materials have attracted considerable research. In this talk, we will show our discovery of a colossal anomalous Hall effect (AHE) observed in a noncoplanar antiferromagnet, which undergoes magnetic phase I, magnetic phase II and polarized ferromagnetic state under field. By analyzing the temperature and sample-dependence of the AHE, we attribute the extraordinary AHE to the strong skew scattering mechanism in magnetic phase II, in contrast to the weak skew scattering observed in both phase I and the polarized ferromagnetic state. We then discuss the possible mechanisms leading to such an extremely large AHE.

*Work at UCLA was supported by the U.S. Department of Energy (DOE), Office of Science, Office of Basic Energy Sciences under Award Number DE-SC0021117. M. M and H. C. acknowledge the support from U.S. DOE BES Early Career Award KC0402010 under Contract No. DE-AC05-00OR22725 and the U.S. DOE, Office of Science User Facility operated by the ORNL.

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Presenters

  • Ni Ni

    • University of California, Los Angeles

Authors

  • Ni Ni

    • University of California, Los Angeles

  • Jay Green

    • UCLA
    • University of California, Los Angeles

  • Madalynn Marshall

    • Kennesaw State University
    • Oak Ridge National Lab

  • Shuai Sun

    • UCLA

  • Eve Emmanouilidou

    • University of California, Los Angeles

  • Huibo Cao

    • Oak Ridge National Laboratory