Structure and magnetic properties of Mn-doped SnS_2 nanopowders prepared by hydrothermal method

摘要

In recent years, layered metal dichalcogenides (LMDs) have drawn extensive attention in fundamental research field due to their unique electronic, mechanical, and optical properties. In addition, magnetic two-dimensional LMDs are considered as a promising candidate for the next-generation spin-tronic devices. The nonmagnetic property of common SnS_2 nanopowders has hampered its applications in spintronics. Doping is an effective way to change the intrinsic properties of non-magnetic semiconductor materials. Pure SnS_2 and Mn-doped SnS_2 were prepared by the hydrothermal method. In this study, undoped SnS_2 has diamagnetism, which is caused by lattice fluctuation. The magnetic property of SnS_2 was obviously enhanced after doped with a small amount of Mn~(2+). The results of VSM investigation showed the enhanced paramagnetism of Mn-doped SnS_2 and weak ferromagnetism as well. It was deduced that the joint effect of the intralayered and interlayered Mn atoms led to the changes in the magnetic properties. Although the magnetism of the samples has been enhanced, the XRD patterns indicated that the crystal structure had not been changed by doping. This work suggested that Mn-doped SnS_2 has potential applications in spintronic devices.