The anomalous Hall effect (AHE) is a quantum coherent transport phenomenon that conventionally vanishes at elevated temperatures because of thermal dephasing. Therefore, it is puzzling that the AHE can survive in heavy metal (HM)/antiferromagnetic (AFM) insulator (AFMI) heterostructures at high temperatures yet disappears at low temperatures. In this paper, an unconventional high‐temperature AHE in HM/AFMI is observed only around the Néel temperature of AFM, with large anomalous Hall resistivity up to 40 nΩ cm is reported. This mechanism is attributed to the emergence of a noncollinear AFM spin texture with a non‐zero net topological charge. Atomistic spin dynamics simulation shows that such a unique spin texture can be stabilized by the subtle interplay among the collinear AFM exchange coupling, interfacial Dyzaloshinski–Moriya interaction, thermal fluctuation, and bias magnetic field.
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Zhang, Shuyuan ; Guan, Jiaqi ; Wang, Yan ; Berlijn, Tom ; Johnston, Steve ; Jia, Xun ; Liu, Bing ; Zhu, Qing ; An, Qichang ; Xue, Siwei ; et al ( , Physical Review B)
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Padmanabhan, Haricharan ; Park, Yoonsang ; Puggioni, Danilo ; Yuan, Yakun ; Cao, Yanwei ; Gasparov, Lev ; Shi, Youguo ; Chakhalian, Jak ; Rondinelli, James M. ; Gopalan, Venkatraman ( , Applied Physics Letters)