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Nonlinear Anomalous Hall Effect for Néel Vector Detection.

Ding-Fu Shao1, Shu-Hui Zhang2, Gautam Gurung1

  • 1Department of Physics and Astronomy and Nebraska Center for Materials and Nanoscience, University of Nebraska, Lincoln, Nebraska 68588-0299, USA.

Physical Review Letters
|February 29, 2020
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Researchers propose using the nonlinear anomalous Hall effect (AHE) to detect the Néel vector in antiferromagnetic (AFM) spintronics. This method offers a new way to read out information in novel AFM devices by measuring a Hall voltage.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Spintronics

Background:

  • Antiferromagnetic spintronics utilizes the Néel vector for advanced device functionalities.
  • Spin-orbit torques (SOTs) enable Néel vector manipulation in specific antiferromagnets.
  • Detecting the Néel vector in antiferromagnets remains a significant experimental challenge.

Purpose of the Study:

  • To introduce a novel detection scheme for the Néel vector in antiferromagnetic spintronics.
  • To explore the potential of the nonlinear anomalous Hall effect (AHE) for Néel vector detection.
  • To identify suitable material systems for this detection method.

Main Methods:

  • Theoretical prediction of nonlinear AHE in compensated antiferromagnets.
  • Analysis of magnetic crystal group symmetry and spin-orbit coupling effects.
  • Density-functional theory (DFT) calculations for the half-Heusler alloy CuMnSb.

Main Results:

  • Nonlinear AHE can detect the Néel vector in compensated antiferromagnets with antidamping SOT.
  • Sizable Berry curvature dipole arises from crystal symmetry and spin-orbit coupling.
  • Measurable Hall voltage predicted in CuMnSb under experimental conditions.
  • Strong dependence of Berry curvature dipole on Néel vector orientation.

Conclusions:

  • Nonlinear AHE provides a viable method for Néel vector detection in AFM spintronics.
  • CuMnSb serves as a promising material for this phenomenon.
  • This work expands the material scope for Berry curvature studies and AFM spintronics.