Skip to main content
placeholder image

Tunable artificial topological Hall effects in van der Waals heterointerfaces

Journal Article


Abstract


  • The topological Hall effect (THE) originating from a real-space Berry phase is a significant transport signal for chiral spin textures and has been extensively investigated recently due to its potential applications in topological spintronics. Recently, chiral spin textures and THE were realized in heterointerfaces where spatial inversion symmetry is naturally broken. However, multichannel transport in heterointerfaces can mask the intrinsic THE associated with chiral spin textures. Here, we systematically investigate multichannel transport in two different kinds of van der Waals (vdW) heterointerfaces. In ferromagnetic-ferromagnetic (FM-FM) heterointerfaces with two opposite anomalous Hall effects, multichannel transport has mimicked both positive and negative THE without involving any topological charges, which is dubbed as an artificial THE. Moreover, artificial THEs were also observed in FM-metal heterointerfaces consisting of a single FM layer stacked onto a nodal-line semimetal; this was attributed to the presence of multichannel transport as well. Our findings provide an alternative explanation for THE-like features in heterointerfaces. They also reveal exotic multichannel transport properties in vdW heterointerfaces which could facilitate the development of multifunctional nanodevices based on vdW heterointerfaces.

Publication Date


  • 2022

Citation


  • Algarni, M., Tan, C., Zheng, G., Albarakati, S., Zhu, X., Partridge, J., . . . Wang, L. (2022). Tunable artificial topological Hall effects in van der Waals heterointerfaces. Physical Review B, 105(15). doi:10.1103/PhysRevB.105.155407

Scopus Eid


  • 2-s2.0-85129089657

Web Of Science Accession Number


Volume


  • 105

Issue


  • 15

Abstract


  • The topological Hall effect (THE) originating from a real-space Berry phase is a significant transport signal for chiral spin textures and has been extensively investigated recently due to its potential applications in topological spintronics. Recently, chiral spin textures and THE were realized in heterointerfaces where spatial inversion symmetry is naturally broken. However, multichannel transport in heterointerfaces can mask the intrinsic THE associated with chiral spin textures. Here, we systematically investigate multichannel transport in two different kinds of van der Waals (vdW) heterointerfaces. In ferromagnetic-ferromagnetic (FM-FM) heterointerfaces with two opposite anomalous Hall effects, multichannel transport has mimicked both positive and negative THE without involving any topological charges, which is dubbed as an artificial THE. Moreover, artificial THEs were also observed in FM-metal heterointerfaces consisting of a single FM layer stacked onto a nodal-line semimetal; this was attributed to the presence of multichannel transport as well. Our findings provide an alternative explanation for THE-like features in heterointerfaces. They also reveal exotic multichannel transport properties in vdW heterointerfaces which could facilitate the development of multifunctional nanodevices based on vdW heterointerfaces.

Publication Date


  • 2022

Citation


  • Algarni, M., Tan, C., Zheng, G., Albarakati, S., Zhu, X., Partridge, J., . . . Wang, L. (2022). Tunable artificial topological Hall effects in van der Waals heterointerfaces. Physical Review B, 105(15). doi:10.1103/PhysRevB.105.155407

Scopus Eid


  • 2-s2.0-85129089657

Web Of Science Accession Number


Volume


  • 105

Issue


  • 15