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Issue 33, 2018
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Robust half-metallicity in transition metal tribromide nanowires

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Abstract

One-dimensional (1D) nanowires (NWs) with robust half-metallicity are a rising star in spintronics. Herein, we theoretically investigate the magnetic and electronic properties of 3d transition-metal tribromide NWs, i.e. TMBr3 (TM = Sc, Ti, V, Cr, Co, and Cu). These systems represent repeated TMBr3 motifs with octahedral configuration, and are expected to be synthesized in a nanotube using an established method. Among these NWs, both VBr3 and CuBr3 NWs exhibit a ferromagnetic (FM) ground state, accompanied by sizable magnetocrystalline anisotropic energy, which is dominated by the superexchange coupling between the TM atoms. Strikingly, a half-metallic nature with a magnetic moment of 4.0μB per unit cell is predicted for the VBr3 NW. By combining with a tight-binding model, we demonstrate that the origin behind the half-metallicity is the half-filled e2 orbitals of the V atoms. The Curie temperature is evaluated to be up to 80 K using Monte Carlo simulations, which is comparable to the temperature of liquid nitrogen. We also find that the half-metallic behavior shows a favorable tolerance to the longitudinal elongation of the wire (∼10%). Additionally, a transition from FM semiconductor to half-metal can be realized in the CuBr3 NW through carrier doping. The coexistence of intrinsic high-temperature FM ordering and half-metallicity endows 1D TMBr3 NWs with great promise for spintronic and photoelectron device applications.

Graphical abstract: Robust half-metallicity in transition metal tribromide nanowires

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Supplementary files

Article information


Submitted
23 Apr 2018
Accepted
26 Jul 2018
First published
30 Jul 2018

Nanoscale, 2018,10, 15545-15552
Article type
Paper

Robust half-metallicity in transition metal tribromide nanowires

S. Li, Y. Wang, S. Hu, D. Chen, C. Zhang and S. Yan, Nanoscale, 2018, 10, 15545 DOI: 10.1039/C8NR03322F

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