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Ferromagnetism in Magnesium Chloride Monolayer with an Unusual large Spin-up Gap


The central target of rapidly evolving spintronic industry is to design highly efficient novel material which consumes very low power and operates with high speed. Besides, main group based ferromagnetic half-metallic materials are very promising due to their long spin-relaxation time. In recent past, the discovery of superconducting state with high critical temperature in a magnesium based system (MgB2) invigorated the researchers due to its simple crystal structure and stimulating results to be used as a good material for large scale application in electronic device. Here, we report ferromagnetism and strong half-metallicity in another Mg-based system, which can be a promising material for spintronics based devices rather than for electronic devices (such as MgB2). Based on the first principle calculations, here we report a series of magnetic half-metallic magnesium chloride based monolayers [(Mg0.89δ0.11Cl2, Mg0.78δ0.22Cl2, and Mg0.67δ0.33Cl2 (MgCl3)]. This MgCl3 phase has a similar pattern like that in CrI3, which has drawn remarkable attention worldwide as a first intrinsic 2D magnet. These magnesium chloride monolayer based systems are 100% spin-polarized, and promising for scattering less transport due to strong half-metallicity and large spin-up gap (~ 6.135 – 6.431 eV). The unusual large spin-up gap in our proposed system may shield spin current leakage even at nanoscale device. Further investigation explores a ferromagnetic ordering in Mg0.89δ0.11Cl2 with a Curie temperature of 250 K, which makes the system viable for operating in little lower than room temperature. High magnetic anisotropy energy (MAE) in Mg0.89δ0.11Cl2 (452.84 μeV) indicates that the energy required to flip the spin is high which inhibit spin fluctuation. These results may construct a promising way to discover MgCl2-based 2D spin valves, GMR, TMR and other spintronics devices.

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Publication details

The article was received on 13 Sep 2018, accepted on 08 Nov 2018 and first published on 08 Nov 2018

Article type: Paper
DOI: 10.1039/C8NR07429A
Citation: Nanoscale, 2018, Accepted Manuscript
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    Ferromagnetism in Magnesium Chloride Monolayer with an Unusual large Spin-up Gap

    G. Bhattacharyya, I. Choudhuri, P. Bhauriyal, P. Garg and B. Pathak, Nanoscale, 2018, Accepted Manuscript , DOI: 10.1039/C8NR07429A

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