Wafer‐scale epitaxial growth of the thickness‐controllable van der Waals ferromagnet CrTe2 for reliable magnetic memory applications

Journal article

To harness the intriguing properties of 2D van der Waals (vdW) ferromagnets (FMs) for versatile applications, the key challenge lies in the reliable material synthesis for scalable device production. Here, the epitaxial growth of single-crystalline 1T-CrTe2 thin films on 2-inch sapphire substrates are demonstrated. Benefiting from the uniform surface energy of the dangling bond-free Al2O3(0001) surface, the layer-by-layer vdW growth mode is observed right from the initial growth stage, which warrants precise control of the sample thickness beyond three monolayer and homogeneous surface morphology across the entire wafer. Moreover, the presence of the Coulomb interaction at the CrTe2/Al2O3 interface plays an important role in tailoring the anomalous Hall response, and the structural optimization of the CrTe2-based spin-orbit torque device leads to a substantial switching power reduction by 54%. The results may lay out a general framework for the design of energy-efficient spintronics based on configurable vdW FMs.

Authors: Liu, X; Huang, P; Xia, Y; Gao, L; Liao, L

• Publication status: Published
• Peer review status: Peer reviewed
• Publisher: Wiley
• Journal: Advanced Functional Materials
• Volume: 33
• Issue: 50
• Article number: 2304454
• Publication date: 2023-09-08
• Acceptance date: 2023-07-07
• DOI: 10.1002/adfm.202304454
• EISSN: 1616-3028
• ISSN: 1616-301X
• Language: English
• Keywords: 2D ferromagnets; spin-orbit torque switches; interface engineering; van der Waals heterostructures; wafer-scale epitaxial growth