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Tunable magnetic anisotropy in 2D magnets via molecular adsorption

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Abstract

2D ferromagnets show promising applications in low energy spintronics. However, the small magnetic anisotropy imposes a great limitation on the application scope. By using first principles modelling, we for the first-time report substantial tuning of magnetic anisotropy of a ferromagnetic CrI3 monolayer via a molecular adsorption strategy. We find that electron or hole doping has a significant impact on the magnetic anisotropy energy of 2D CrI3. Then we propose to realize charge carrier doping by the adsorption of electrophilic/nucleophilic molecules (TCNQ/TTF) on 2D CrI3. The largely controllable magnetic anisotropy is confirmed due to the interfacial electrostatic effects. Additionally, the out-of-plane magnetic anisotropy is also sensitive to the concentrations of organic molecules. The highest value reaches 1.17 meV Cr−1 in the hole-doped TCNQ-CrI3, while the lowest one is 0.20 meV Cr−1 in the electron-doped TTF-CrI3. Our work offers a feasible route to modulate the magnetic anisotropy of 2D magnets for practical magnetic applications.

Graphical abstract: Tunable magnetic anisotropy in 2D magnets via molecular adsorption

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Article information


Submitted
26 Aug 2020
Accepted
29 Sep 2020
First published
29 Sep 2020

J. Mater. Chem. C, 2020, Advance Article
Article type
Paper

Tunable magnetic anisotropy in 2D magnets via molecular adsorption

C. Tang, L. Zhang and A. Du, J. Mater. Chem. C, 2020, Advance Article , DOI: 10.1039/D0TC04049E

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