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Ferromagnetism in freestanding MoS2 nanosheets

Daqiang Gao, Mingsu Si, Jinyun Li, Jing Zhang, Zhipeng Zhang, Zhaolong Yang and Desheng Xue*

Author affiliations

Key Laboratory for Magnetism and Magnetic Materials of MOE, Lanzhou University, Lanzhou, 730000, People's Republic of China

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Citation and License

Nanoscale Research Letters 2013, 8:129  doi:10.1186/1556-276X-8-129

Published: 16 March 2013

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.

Keywords:
Ferromagnetism; MoS2 nanosheets; Exfoliation