Nonlinear anomalous Hall effect for Néel vector detection
ORAL
Abstract
The manipulation and detection of the Néel vector are cores of antiferromagnetic (AFM) spintronics. Recent studies have shown that the field-like and antidamping spin-orbit torques (SOT) can be used to switch the Néel vector in antiferromagnets with proper symmetries. On the other hand, the efficient detection of the AFM order parameter remains a challenging problem. Here, we predict that the nonlinear anomalous Hall effect (AHE) can be used to detect the Néel vector in most compensated antiferromagnets supporting the antidamping SOT. The magnetic crystal group symmetry of these antiferromagnets combined with spin-orbit coupling results in a sizable Berry curvature dipole and hence the nonlinear AHE. As a specific example, we consider half Heusler alloy CuMnSb, which Néel vector can be switched by the antidamping SOT. Based on density functional theory calculations, we show that the nonlinear AHE in CuMnSb produces a measurable Hall voltage under conventional experimental conditions. The strong dependence of the Berry curvature dipole on the Néel vector orientation provides a new detection scheme of the AFM order parameter based on the nonlinear AHE.
–
Presenters
Ding-Fu Shao
Department of Physics and Astronomy, University of Nebraska - Lincoln, University of Nebraska - Lincoln, Department of Physics and Astronomy & Nebraska Center for Materials and Nanoscience, University of Nebraska - Lincoln
Authors
Ding-Fu Shao
Department of Physics and Astronomy, University of Nebraska - Lincoln, University of Nebraska - Lincoln, Department of Physics and Astronomy & Nebraska Center for Materials and Nanoscience, University of Nebraska - Lincoln
Shuhui Zhang
College of Science, Beijing University of Chemical Technology
Gautam Gurung
Department of Physics and Astronomy, University of Nebraska - Lincoln, University of Nebraska - Lincoln
Wen Yang
Beijing Computational Science Research Center
Evgeny Y Tsymbal
Department of Physics and Astronomy, University of Nebraska - Lincoln, University of Nebraska - Lincoln, Department of Physics and Astronomy, University of Nebraska-Lincoln, Department of Physics and Astronomy & Nebraska Center for Materials and Nanoscience, University of Nebraska - Lincoln
