Giant Topological Hall Effect and Superstable Spontaneous Skyrmions below 330 K in a Centrosymmetric Complex Noncollinear Ferromagnet NdMn<sub>2</sub>Ge<sub>2</sub>
Shaobo Wang, Qingwen Zeng, Danmin Liu, Hongguo Zhang, Lin Ma, Guoliang Xu, Yuntian Liang, Zhenlu Zhang, Hui Wu, Renchao Che, Xiaodong Han, Q. Huang
Abstract
Skyrmions with topologically nontrivial spin textures are promising information carriers in next-generation ultralow power consumption and high-density spintronic devices. To promote their further development and utilization, the search for new room temperature skyrmion-hosting materials is crucial. Considering that most of the previous skyrmion-hosting materials are noncollinear magnets, here, the detection of the topological Hall effect (THE) and the discovery of skyrmions at room temperature are first reported in a centrosymmetric complex noncollinear ferromagnet NdMn2Ge2. Below 330 K, the compound can host stable Bloch-type skyrmions with about 75 nm diameter in a wide window of magnetic field and temperature, including zero magnetic field and room temperature. Moreover, the skyrmions can induce a giant topological Hall effect in a wide temperature range with a maximum value of −2.05 μΩ cm. These features make the compound attractive for both fundamental research and potential application in novel spintronic devices.