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High Curie temperature and intrinsic ferromagnetic half-metallicity in two-dimensional Cr3X4 (X = S, Se, Te) nanosheets

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Abstract

Two-dimensional (2D) intrinsic magnetic materials with room temperature ferromagnetism and complete spin-polarization are highly desirable for realizing advanced spintronic devices. However owing to the weak d–p–d super-exchange interaction, many recently realized 2D ferromagnetic (FM) materials present a very low Curie temperature (TC). Here, based on first principles calculations, we report a series of Cr3X4 (X = S, Se, Te) monolayers, in which the coexistence of two oxidation states of Cr atoms results in double-exchange interaction and thereby enhances FM coupling greatly and improves TC up to 370 K for Cr3Se4 and 460 K for Cr3Te4, respectively. Spin-polarized calculations further demonstrate that Cr3Se4 and Cr3Te4 monolayers are FM half-metals, which ideally could achieve 100% spin-polarized currents. Meanwhile, excellent dynamical and thermal stabilities are identified, and a possible synthetic strategy is proposed. Our work not only provides two competitive ferromagnetic candidate materials for nanoscale spintronic applications, but also shows that double-exchange interaction may be a way to realize 2D room temperature FM half-metals.

Graphical abstract: High Curie temperature and intrinsic ferromagnetic half-metallicity in two-dimensional Cr3X4 (X = S, Se, Te) nanosheets

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Publication details

The article was received on 19 Jan 2019, accepted on 25 Feb 2019 and first published on 25 Feb 2019


Article type: Communication
DOI: 10.1039/C9NH00038K
Nanoscale Horiz., 2019, Advance Article

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    High Curie temperature and intrinsic ferromagnetic half-metallicity in two-dimensional Cr3X4 (X = S, Se, Te) nanosheets

    X. Zhang, B. Wang, Y. Guo, Y. Zhang, Y. Chen and J. Wang, Nanoscale Horiz., 2019, Advance Article , DOI: 10.1039/C9NH00038K

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