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

Abstract

To harness the intriguing properties of two-dimensional van der Waals (vdW) ferromagnets (FMs) for versatile applications, the key challenge lies in the reliable material synthesis for scalable device production. Here, we demonstrate the epitaxial growth of single-crystalline 1T-CrTe2 thin films on 2-inch sapphire substrates. 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 and atomically smooth surface morphology across the entire wafer. Moreover, the presence of the Coulomb interaction at the CrTe2/Al2O3 interface serves as an effective tuning parameter to tailor 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%. Our results may lay out a general framework for the design of energy-efficient spintronics based on configurable vdW FMs.

20 pages, 4 figures

References in corpus (6)

• First Principles Calculation of Anomalous Hall Conductivity in Ferromagnetic bcc Fe
• Antisymmetric magnetoresistance in van der Waals Fe3GeTe2/graphite/Fe3GeTe2 tri-layer heterostructures
• In-plane magnetic domains and Néel-like domain walls in thin flakes of the room temperature CrTe${}_2$ van der Waals ferromagnet
• ZrTe2/CrTe2: an epitaxial van der Waals platform for spintronics
• Sign-tunable anomalous Hall effect induced by two-dimensional symmetry-protected nodal structures in ferromagnetic perovskite oxide thin films
• Visualizing Van der Waals Epitaxial Growth of Two-Dimensional Heterostructures

Cited by in corpus (4)

• Efficient current-induced spin torques and field-free magnetization switching in a room-temperature van der Waals magnet
• Magnetic Switching in Monolayer 2D Diluted Magnetic Semiconductors via Spin-to- Spin Conversion
• Magnetic properties of monolayer, multilayer, and bulk CrTe${}_2$
• Many-body electronic structure, self-doped double-exchange, and Hund metallicity in 1T-CrTe2 bulk and monolayer