Two-dimensional (2D) ferromagnets have attracted widespread
attention
for promising applications in compact spintronic devices. However,
the controlled synthesis of high-quality, large-sized, and ultrathin
2D magnets via facile, economical method remains challenging. Herein,
we develop a hydrogen-tailored chemical vapor deposition approach
to fabricating 2D Cr5Te8 ferromagnetic nanosheets.
Interestingly, the time period of introducing hydrogen was found to
be crucial for controlling the lateral size, and a Cr5Te8 single-crystalline nanosheet of lateral size up to ∼360
μm with single-unit-cell thickness has been obtained. These
samples exhibit a leading role of domain wall nucleation in governing
the magnetization reversal process, providing important references
for optimizing the performances of associated devices. The nanosheets
also show notable magnetotransport response, including nonmonotonous
magnetic-field-dependent magnetoresistance and sizable anomalous Hall
resistivity, demonstrating Cr5Te8 as a promising
material for constructing high-performance magnetoelectronic devices.
This study presents a breakthrough of large-sized CVD-grown 2D magnetic
materials, which is indispensable for constructing 2D spintronic devices.