Speaker
Description
Van der Waals (vdW) heterostructures enable tailored electronic and magnetic phases by stacking atomically thin layers with pristine interfaces [1–2].
Here, we investigate fully 2D Cr₂Ge₂Te₆/WTe₂ heterostructures and identify a strong enhancement of ferromagnetism in Cr₂Ge₂Te₆ (CGT). Magnetotransport measurements across multiple devices with WTe₂ thicknesses ranging from monolayer to bulk reveal a robust anomalous Hall effect together with a more than twofold increase of the Curie temperature and substantially enhanced coercive fields. Interface microscopy confirms chemically abrupt vdW interfaces with no detectable interdiffusion, while control experiments rule out processing- or strayfield-induced artifacts. Our experiments and theoretical calculations demonstrate that interfacial charge transfer renders CGT conductive and that proximity-induced lattice distortions in CGT enhance exchange and magnetocrystalline anisotropy [3].
These results establish strainmediated lattice reconstruction as a practical strategy for engineering hightemperature magnetic order in 2D heterostructures [4–6] and clarify that proximity effects in vdW stacks can be governed by modifications within the
magnetic layer itself.
[1] Geim A.K., Grigorieva I.V., Nature, 499 (2013) 419
[2] Novoselov K.S., et al., Science, 353 (2016) aac9439
[3] Herling F., et al., Nano Lett. 26, 16, (2026) 5434–5442
[4] Sierra J.F., et al., Nat. Nanotechnol., 16 (2021) 856
[5] Dong X.-J., et al., Phys. Rev. B, 102 (2020) 144443
[6] Dong X.-J., et al., Phys. Rev. Appl., 12 (2019) 014020