Magnetic information is usually stored in ferromagnets, where the ‚Üë and ‚Üì spin states are distinguishable due to time-reversal symmetry breaking. These states induce opposite signs of the Hall effect proportional to magnetization, which is widely used for their electrical read-out. By contrast, conventional antiferromagnets with a collinear antiparallel spin configuration cannot host such functions, because of \({\mathcal{T}}{\mathrm{t}}\) symmetry (time-reversal \({\mathcal{T}}\) followed by translation t symmetry) and lack of macroscopic magnetization. Here we report the experimental observation of a spontaneous Hall effect in the collinear antiferromagnet FeS at room temperature. In this compound, the ‚Üë‚Üì and ‚Üì‚Üë spin states induce opposite signs of the spontaneous Hall effect. Our analysis suggests that this does not reflect magnetization, but rather originates from a fictitious magnetic field associated with the \({\mathcal{T}}{\mathrm{t}}\)-symmetry-broken antiferromagnetic order. The present results pave the way for electrical reading and writing of the ‚Üë‚Üì and ‚Üì‚Üë spin states in conductive systems at room temperature, and suggest that \({\mathcal{T}}{\mathrm{t}}\)-symmetry-broken collinear antiferromagnets can serve as an information medium with vanishingly small magnetization.

磁性信息通常存储在铁磁体中，由于时间反转对称性被打破，'Üë 和 'Üì 自旋态是可以区分的。这些状态会感应出与磁化成正比的霍尔效应的相反符号，磁化被广泛用于其电气读数。相比之下，具有共线反平行自旋构型的常规反铁磁体无法承载此类函数，因为 \（{\mathcal{T}}{\mathrm{t}}\） 对称性（时间反转 \（{\mathcal{T}}\） 后跟平移 t 对称性）和缺乏宏观磁化。在这里，我们报告了在室温下共线反铁磁体 FeS 中自发霍尔效应的实验观察结果。在这种化合物中，'Üë'Üì 和 'Üì'Üë 自旋态会引起自发霍尔效应的相反迹象。我们的分析表明，这并不反映磁化强度，而是源于与 \（{\mathcal{T}}{\mathrm{t}}\） 对称性断开的反铁磁顺序相关的虚构磁场。目前的结果为室温下导电系统中 'Üë'Üì 和 'Üì'Üë 自旋态的电读写铺平了道路，并表明 \（{\mathcal{T}}{\mathrm{t}}\） 对称性断开的共线反铁磁体可以用作磁化强度消失的信息介质。