Electrical control of topological 3Q state in intercalated van der Waals antiferromagnet Cox-TaS2

Junghyun Kim, Kai-Xuan Zhang (), Pyeongjae Park, Woonghee Cho, Hyuncheol Kim, Han-Jin Noh and Je-Geun Park ()
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Junghyun Kim: Seoul National University
Kai-Xuan Zhang: Seoul National University
Pyeongjae Park: Seoul National University
Woonghee Cho: Seoul National University
Hyuncheol Kim: Seoul National University
Han-Jin Noh: Chonnam National University
Je-Geun Park: Seoul National University

Nature Communications, 2025, vol. 16, issue 1, 1-7

Abstract: Abstract Van der Waals (vdW) magnets have opened a new avenue of opportunities encompassing various interesting phases. Co1/3TaS2–an intercalated metallic vdW antiferromagnet–is one of the latest additions to this growing list of materials due to its unique topologically nontrivial triple-Q (3Q) ground state. This 3Q tetrahedral structure, which critically depends on the Co content, yields the highest-density Skyrmion lattice with scalar spin chirality, resulting in a noticeable anomalous Hall effect. In this work, we demonstrate control of this topological phase via ionic gating. Using four CoxTaS2 devices with different Co compositions, we show that ionic gating can cover the entire 3Q topological phase and reveal the nature of the thermodynamically inaccessible phase space. Another striking finding in our data is the existence of an adiabatic discontinuity in the phase boundary between the 3Q and 1Q phases. Our work constitutes one of the first examples of electrical control of scalar spin chirality using an antiferromagnetic metal.

Date: 2025
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DOI: 10.1038/s41467-025-63991-1

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