title: Ferromagnetism in freestanding MoS2 nanosheets.
abstract: Freestanding MoS2 nanosheets with different sizes were prepared through a simple exfoliated method by tuning the ultrasonic time in the organic solvent. Magnetic measurement results reveal the clear room-temperature ferromagnetism for all the MoS2 nanosheets, in contrast to the pristine MoS2 in its bulk form which shows diamagnetism only. Furthermore, results indicate that the saturation magnetizations of the nanosheets increase as the size decreases. Combining the X-ray photoelectron spectroscopy, transmission electron microscopy, and electron spin resonance results, it is suggested that the observed magnetization is related to the presence of edge spins on the edges of the nanosheets. These MoS2 nanosheets may find applications in nanodevices and spintronics by controlling the edge structures.
authors.affiliation: Key Laboratory for Magnetism and Magnetic Materials of MOE, Lanzhou University, Lanzhou, 730000, People's Republic of China. xueds@lzu.edu.cn.
authors.forename: Daqiang
authors.initials: D
authors.lastname: Gao
authors.forename: Mingsu
authors.initials: M
authors.lastname: Si
authors.forename: Jinyun
authors.initials: J
authors.lastname: Li
authors.forename: Jing
authors.initials: J
authors.lastname: Zhang
authors.forename: Zhipeng
authors.initials: Z
authors.lastname: Zhang
authors.forename: Zhaolong
authors.initials: Z
authors.lastname: Yang
authors.forename: Desheng
authors.initials: D
authors.lastname: Xue