  Recently, 2D Cr5Te8 has been successfully synthesized experimentally and has
attracted widespread research interest due to its intriguing magnetic
properties, such as hard magnetism with strong perpendicular anisotropy.
However, exploring new methods for growing ultrathin 2D Cr5Te8 with a larger
scale and their controllable synthesis remain challenging. Herein, the
synthesis of ultrathin 2D ferromagnetic Cr5Te8 nanosheets by chemical vapor
deposition (CVD) using GaTe as growth source is reported, whose size is up to
~160 {\mu}m and the thickness is lower to only 5 nm. The GaTe promotes the
concentration of effective Te atoms to facilitate the direction of the
synthesis reaction, enabling the rapid lateral growth rate. As a result, the
synthesis of ultrathin, large-scale 2D ferromagnetic Cr5Te8 was achieved. By
precisely adjusting the growth temperature and the source-substrate distance
(Dss), the lateral size of the Cr5Te8 nanosheets can be tuned from a few to
~164 {\mu}m. Furthermore, magnetic property measurement system (MPMS) suggested
that Cr5Te8 nanosheets possess intense out-of-plane ferromagnetism and the
Curie temperature exhibits a monotonic increase from 163 to 175 K as the Cr5Te8
thickness. This work not only paves a way for the controllable growth of
ultrathin, large-scale 2D ferromagnetic crystalline, but also provides a new
platform for the spintronics and the practical application of magnetic memory
devices.
