Chiral fluctuation driven topological Hall effect in two-dimensional ferromagnets

ORAL

Abstract

Topological Hall effect (THE) is a real space Berry phase phenomenon originated from the non-coplanar spin texture[1]. Recently THE has been associated with the formation of skyrmions in chiral magnets[2][3]. Although chiral fluctuation driven topological charges have been predicted in chiral magnets, the resultant THE has not been observed yet[4]. Herein, we report a surprising observation of THE around ferromagnetic transition temperature TC in the ferromagnetic SrRuO3 thin films. The temperature, magnetic field, and thickness dependence of THE are in good agreement with our Monte-Carlo simulations, which provides compelling evidence of the emergence of net topological charges due to chiral fluctuation.

References:
[1] Y. Taguchi, Y. Oohara, H. Yoshizawa, N. Nagaosa, Y. Tokura, Science 291, 2573 (2001).
[2] A. Neubauer, et al., Phys. Rev. Lett. 102, 186602 (2009).
[3] N. Kanazawa, et al., Phys. Rev. Lett. 106, 156603 (2011).
[4] W.-T. Hou, J.-X. Yu, M. Daly, J. Zang, Phys. Rev. B 96, 140403(R) (2017).

*This work is supported by DOE BES under award # DE-SC0018153

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Presenters

  • Wenbo Wang

    • Department of Physics and Astronomy, Rutgers University, Piscataway, NJ 08854, USA

Authors

  • Wenbo Wang

    • Department of Physics and Astronomy, Rutgers University, Piscataway, NJ 08854, USA

  • Matthew W Daniels

    • Institute for Research in Electronics and Applied Physics, University of Maryland, College Park, MD 20742

  • Zhaoliang Liao

    • National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, 230026 Anhui, People’s Republic of China

  • Jun Wang

    • MESA+ Institute for Nanotechnology, University of Twente, 7500 AE Enschede, the Netherlands

  • Gertjan Koster

    • University of Twente
    • MESA+ Institute for Nanotechnology, University of Twente, 7500 AE Enschede, the Netherlands

  • Guus Rijnders

    • MESA+ Institute for Nanotechnology, University of Twente, 7500 AE Enschede, the Netherlands

  • Di Xiao

    • Department of Physics, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA
    • Carnegie Mellon University
    • Carnegie Mellon Univ
    • Department of Physics, Carnegie Mellon University

  • Weida Wu

    • Department of Physics and Astronomy, Rutgers University, Piscataway, NJ 08854, USA
    • Department of Physics and Astronomy, Rutgers University
    • Physics and Astronomy, Rutgers University, New Brunswick
    • Rutgers University, New Brunswick