近日，东北大学张宪民团队研究了具有自旋-层耦合的单层共线反铁磁材料垂直奈尔矢量检测。2025年12月25日，《美国化学会志》发表了这一成果。

在二维反铁磁自旋电子学发展中，对共线反铁磁材料中垂直奈尔矢量的精准检测一直是亟待突破的关键问题。

研究组提出利用层霍尔效应，在直至单层极限的共线反铁磁体中实现垂直奈尔矢量检测。通过材料筛选，发现Co₂S₂是具有自旋-层耦合特性及垂直磁各向异性的原型反铁磁单层材料。得益于自旋-层耦合产生的电调控层锁定能带边缘与贝里曲率，单层Co₂S₂获得了高达约110 S/cm的层极化反常霍尔电导σ_xy。

值得注意的是，当奈尔矢量反转时σ_xy的符号随之改变，这为反铁磁序的检测提供了有效途径。此外，研究在交变磁性单层材料Ca(CoN)₂中进一步验证了通过层霍尔效应实现奈尔矢量检测的可行性。该发现为探索原子尺度反铁磁材料与自旋电子器件的奈尔矢量检测开辟了新路径。

附：英文原文

Title: Perpendicular Néel Vector Detection of Monolayer Collinear Antiferromagnets with Spin-Layer Coupling

Author: Li Deng, Fei Wang, Xiang Yin, Junwei Tong, Yanzhao Wu, Xianmin Zhang

Issue&Volume: December 25, 2025

Abstract: The precise detection of a perpendicular Néel vector in collinear antiferromagnetic (AFM) materials has long been expected for advancing two-dimensional AFM spintronics. Here, we proposed the perpendicular Néel vector detection using the layer Hall effect in collinear antiferromagnets down to the monolayer limit. Through materials screening, the Co2S2 is identified as a prototypical AFM monolayer with the spin-layer coupling and perpendicular magnetic anisotropy. Thanks to the electrically engineered layer-locked band edges and Berry curvatures from spin-layer coupling, a sizable layer-polarized anomalous Hall conductivity of  σxy up to ～110 S/cm is obtained in monolayer Co2S2. Intriguingly, the sign of  σxy changes when the Néel vector is reversed, providing an efficient route for detecting the AFM order. Moreover, the achievement of the Néel vector detection via the layer Hall effect is further demonstrated in altermagnetic monolayer Ca(CoN)2. The present findings open an avenue to explore the Néel vector detection for atomic-scale AFM materials and spintronic devices.

DOI: 10.1021/jacs.5c19267

Source: https://pubs.acs.org/doi/abs/10.1021/jacs.5c19267