Chemical vapor deposition of large-area ultrathin Cr3Te4 nanosheets with robust ferromagnetism

Abstract Chromium tellurides represent a novel class of two-dimensional ferromagnets with significant potential for advanced electronic applications, including spintronics and magnonics. Despite their promise, the fabrication of large-area samples remains a considerable challenge. In this study, we report a facile modification to the common ambient-pressure chemical vapor deposition setup that enables the synthesis of ultrathin Cr3Te4nanosheets (6.4 nm thick) with lateral dimensions exceeding 100 μm. Our findings reveal that by tuning both the growth temperature and the distance between the precursor and substrate, the vapor pressure of the precursor can be precisely controlled, significantly impacting the size and morphology of the synthesized Cr3Te4 nanosheets. The resulting large-size Cr3Te4exhibits robust ferromagnetism, with a Curie temperature reaching 178 K. This advancement in the preparation of large-area Cr3Te4nanosheets opens new avenues for their integration into next-generation electronic devices.