Work

Designing Nontrivial Real‐Space Berry Curvature through Non‐Monotonic Bulk Inversion Symmetry Breaking in Self‐Intercalated Cr1+δTe2

Year: 2025

Type: article

Abstract: The real‐space Berry curvature () in magnetic materials has gained significant attention for its potential applications in chiral spintronic devices. manifests in chiral spin textures stabilized by the Dzyaloshinskii–Moriya interaction (DMI), which arises in inversion‐asymmetric systems. Herein, the topological Hall effect (THE) in 2D ferromagnet Cr1+δTe2 as a function of the Cr intercalant (δ) is investigated. A nonlinear dependence of the THE amplitude induced by on δ is identified, originating from non‐monotonic bulk inversion symmetry breaking via Cr self‐intercalation. Density‐functional theory calculations further reveal a strong correlation between THE amplitude and bulk DMI strength (EDMI), demonstrating both the mechanism of THE and the tunability of in Cr1+δTe2. Remarkably, Cr1.612Te2 exhibits the largest THE amplitude observed to date (2.75 μΩ⋅cm) in the Cr1+δTe2 family, which is a strong candidate for the highest THE amplitude, given its magnetic anisotropy and EDMI. Overall, by confirming the critical role of bulk DMI and magnetic anisotropy in engineering , the most efficient strategy for designing in 2D ferromagnetic materials through atomic‐scale self‐intercalation is proposed. These findings provide fundamental insights into the relationship between EDMI and THE in Cr1+δTe2 and offer a promising approach for designing high‐performance chiral spintronic devices.

Source: Small Science

DOI: 10.1002/smsc.202500028