Tunable Physical Properties of VSe2 hexagonal disks

Abstract

Transition metal dichalcogenides (TMDs) belonging to the family of two-dimensional (2D) materials have received a great deal of research interest over the past few decades due to their unique electronic, optical, mechanical, and magnetic properties as compared to their three-dimensional (3D) counterparts. Magnetism in reduced dimensions, such as in 2D materials, is an underexplored phenomenon, though it has potential for numerous applications, including the fabrication of memory devices and spintronics devices. In this work, we report the structural, morphological, and magnetic characterization of hexagonal disks of VSe2 prepared by the hydrothermal method. The structural and morphological characterization confirms the formation of hexagonal disks of 1T-VSe2. The magnetic measurements show that hexagonal VSe2 is paramagnetic in the entire range of this study, from 5–300 K, with an S–type isothermal magnetization behavior at low temperatures. The field cooling (FC) data collected at an applied magnetic field of 0.5T reveals a hump at a temperature of 118 K, which can be correlated to the charge density wave (CDW) transition point. The increase in CDW transition temperature from 107 K (bulk) to 118 K indicates a decrease in VSe2 thickness. The detailed analysis shows a tunability in the physical properties of VSe2 with its thickness.