Two-dimensional van der Waals ferromagnetic thin film CrTe2 with high Curie temperature and metallic conductivity

Two-dimensional van der Waals (2D vdW) materials have opened up an opportunity to explore an innovative spin-based magnetic nanodevice. However, controllable fabrication of 2D vdW ferromagnets with high Curie temperature remains challenging. In this paper, we reported the growth of 2D CrTe2 single-crystal films epitaxially on Al2O3 substrates using pulsed laser deposition. We find that it shows a typical paramagnetic-ferromagnetic (PM-FM) phase transition around 200 K. The precise Curie temperature and Weiss temperature are 189 and 206.7 K, respectively. The saturation magnetization reaches 73.64 emu/g for the film thickness of 30 nm. The critical exponent beta = 0.329 indicates that the magnetic interactions obey the 3D-Ising model. Electronic transport measurement confirms that a CrTe2 film always remains a metallic behavior at 5 K <= T <= 320 K and the resistivity of room temperature is 1.5 m omega/cm. The first-principles calculation uncovers that the FM ordering state mainly stems from an exchange coupling of the adjacent Cr-spin t(2g) polarized electrons and the metallic conductivity is due to p-d orbital hybridization between Cr and Te atoms. This work would shed new light on studying large-scale growth of 2D magnets and developing 2D magnet-based nanodevices of room temperature.

Automated summary

In this paper, the growth of 2D CrTe2 single-crystal films on Al2O3 substrates using pulsed laser deposition is reported. The films exhibit a typical paramagnetic-ferromagnetic phase transition around 200 K, with a high Curie temperature. The saturation magnetization reaches 73.64 emu/g for a film thickness of 30 nm. Furthermore, electronic transport measurement confirms that the CrTe2 film displays metallic behavior in the temperature range of 5 K <= T <= 320 K with a resistivity of 1.5 m omega/cm. First-principles calculation reveals that the ferromagnetic ordering is mainly due to exchange coupling of adjacent Cr-spin t(2g) polarized electrons, and the metallic conductivity arises from p-d orbital hybridization between Cr and Te atoms. This work provides new insights for studying large-scale growth of 2D magnets and developing room temperature 2D magnet-based nanodevices.