Room-temperature intrinsic ferromagnetism in epitaxial CrTe<sub>2</sub> ultrathin films.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 33941773.
- Also identified by DOI 10.1038/s41467-021-22777-x and PMC identifier 8093203.
- Licence recorded as CC BY.
- The licence permits redistribution, so the abstract is shown in full and the full text is available from the publisher.
Abstract
While the discovery of two-dimensional (2D) magnets opens the door for fundamental physics and next-generation spintronics, it is technically challenging to achieve the room-temperature ferromagnetic (FM) order in a way compatible with potential device applications. Here, we report the growth and properties of single- and few-layer CrTe<sub>2</sub>, a van der Waals (vdW) material, on bilayer graphene by molecular beam epitaxy (MBE). Intrinsic ferromagnetism with a Curie temperature (T<sub>C</sub>) up to 300 K, an atomic magnetic moment of ~0.21 [Formula: see text]/Cr and perpendicular magnetic anisotropy (PMA) constant (K<sub>u</sub>) of 4.89 × 10<sup>5</sup> erg/cm<sup>3</sup> at room temperature in these few-monolayer films have been unambiguously evidenced by superconducting quantum interference device and X-ray magnetic circular dichroism. This intrinsic ferromagnetism has also been identified by the splitting of majority and minority band dispersions with ~0.2 eV at Г point using angle-resolved photoemission spectroscopy. The FM order is preserved with the film thickness down to a monolayer (T<sub>C</sub> ~ 200 K), benefiting from the strong PMA and weak interlayer coupling. The successful MBE growth of 2D FM CrTe<sub>2</sub> films with room-temperature ferromagnetism opens a new avenue for developing large-scale 2D magnet-based spintronics devices.