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Issue 15, 2017
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Experimental and theoretical evidence for the ferromagnetic edge in WSe2 nanosheets

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Abstract

Bulk TMDCs are diamagnetic materials; however, two-dimensional TMDCs exhibit spin polarized edge states, which results in a coupling between the unsaturated transition metal and chalcogenide atoms at the edges. The magnetism in two-dimensional TMDCs broadens their applications in spintronic and multi-functional devices. Herein, by combining macro/micro-magnetic experimental measurements and density functional theory (DFT) calculations, we demonstrate that among five possible edge-terminated WSe2 nanosheets only two types have a magnetic ground state, corresponding to the 100% Se edge terminated and 50% Se edge terminated nanosheets, respectively. The calculation results on WSe2 clusters and WSe2 zig-zag nanoribbons with different terminations and Se coverage rate confirmed that the unpaired electrons of the edge atoms play a crucial role in the appearance of ferromagnetism in WSe2 nanosheets. Furthermore, due to the possible quantum confinement effect and surface effect, there exist thickness-dependent magnetic properties, and the magnitude of magnetism at the edge increases as the number of layers decreases.

Graphical abstract: Experimental and theoretical evidence for the ferromagnetic edge in WSe2 nanosheets

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Publication details

The article was received on 18 Jan 2017, accepted on 20 Feb 2017 and first published on 22 Feb 2017


Article type: Paper
DOI: 10.1039/C7NR00410A
Citation: Nanoscale, 2017,9, 4898-4906
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    Experimental and theoretical evidence for the ferromagnetic edge in WSe2 nanosheets

    L. Tao, F. Meng, S. Zhao, Y. Song, J. Yu, X. Wang, Z. Liu, Y. Wang, B. Li, Y. Wang and Y. Sui, Nanoscale, 2017, 9, 4898
    DOI: 10.1039/C7NR00410A

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