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  • Letter

Spin-neutral tunneling anomalous Hall effect

Ding-Fu Shao1,*,†, Shu-Hui Zhang2,*,‡, Rui-Chun Xiao3, Zi-An Wang1,4, W. J. Lu1, Y. P. Sun6,1,7, and Evgeny Y. Tsymbal5,§

  • 1Key Laboratory of Materials Physics, Institute of Solid State Physics, HFIPS, Chinese Academy of Sciences, Hefei 230031, China
  • 2College of Mathematics and Physics, Beijing University of Chemical Technology, Beijing 100029, China
  • 3Institute of Physical Science and Information Technology, Anhui University, Hefei 230601, China
  • 4University of Science and Technology of China, Hefei 230026, China
  • 5Department of Physics and Astronomy & Nebraska Center for Materials and Nanoscience, University of Nebraska, Lincoln, Nebraska 68588-0299, USA
  • 6High Magnetic Field Laboratory, HFIPS, Chinese Academy of Sciences, Hefei 230031, China
  • 7Collaborative Innovation Center of Microstructures, Nanjing University, Nanjing 210093, China

  • *These authors contributed equally to this work.
  • †dfshao@issp.ac.cn
  • ‡shuhuizhang@mail.buct.edu.cn
  • §tsymbal@unl.edu
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Phys. Rev. B 106, L180404 – Published 21 November, 2022

DOI: https://doi.org/10.1103/PhysRevB.106.L180404

Abstract

The anomalous Hall effect (AHE) is a fundamental spin-dependent transport property that is widely used in spintronics. It is generally expected that currents carrying net spin polarization are required to drive the AHE. Here, we demonstrate that, in contrast to this common expectation, a spin-neutral tunneling AHE (TAHE), i.e., a TAHE driven by spin-neutral currents, can be realized in an antiferromagnetic (AFM) tunnel junction where an AFM electrode with a non-spin-degenerate Fermi surface and a normal metal electrode are separated by a nonmagnetic barrier with strong spin-orbit coupling (SOC). The symmetry mismatch between the AFM electrode and the SOC barrier results in an asymmetric spin-dependent momentum filtering of the spin-neutral longitudinal current generating the transverse Hall current in each electrode. We predict a sizable spin-neutral TAHE in an AFM tunnel junction with a RuO2-type AFM electrode and a SnTe-type SOC barrier and show that the Hall currents are reversible by the Néel vector switching. With the Hall angle being comparable with that in conventional AHE bulk materials, the predicted spin-neutral TAHE can be used for the Néel vector detection in AFM spintronics.

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Phys. Rev. B 106, L180404– Published 21 November, 2022
  • Received 27 July 2022
  • Revised 7 November 2022
  • Accepted 8 November 2022
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