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Tuning 2D magnetism in Fe3+XGeTe2films by element doping

Liu, S and Li, Z and Yang, K and Zhang, E and Narayan, A and Zhang, X and Zhu, J and Liu, W and Liao, Z and Kudo, M and Toriyama, T and Yang, Y and Li, Q and Ai, L and Huang, C and Sun, J and Guo, X and Bao, W and Deng, Q and Chen, Y and Yin, L and Shen, J and Han, X and Matsumura, S and Zou, J and Xu, Y and Xu, X and Wu, H and Xiu, F (2022) Tuning 2D magnetism in Fe3+XGeTe2films by element doping. In: National Science Review, 9 (6).

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Official URL: https://doi.org/10.1093/nsr/nwab117


Two-dimensional (2D) ferromagnetic materials have been discovered with tunable magnetism and orbital-driven nodal-line features. Controlling the 2D magnetism in exfoliated nanoflakes via electric/magnetic fields enables a boosted Curie temperature (TC) or phase transitions. One of the challenges, however, is the realization of high TC 2D magnets that are tunable, robust and suitable for large scale fabrication. Here, we report molecular-beam epitaxy growth of wafer-scale Fe3+XGeTe2 films with TC above room temperature. By controlling the Fe composition in Fe3+XGeTe2, a continuously modulated TC in a broad range of 185-320 K has been achieved. This widely tunable TC is attributed to the doped interlayer Fe that provides a 40 enhancement around the optimal composition X = 2. We further fabricated magnetic tunneling junction device arrays that exhibit clear tunneling signals. Our results show an effective and reliable approach, i.e. element doping, to producing robust and tunable ferromagnetism beyond room temperature in a large-scale 2D Fe3+XGeTe2 fashion.

Item Type: Journal Article
Publication: National Science Review
Publisher: Oxford University Press
Additional Information: The copyright for this article belongs to the Authors.
Keywords: Ferromagnetic materials; Ferromagnetism; Iron; Molecular beam epitaxy; Semiconductor doping; Technetium, 2d ferromagnetic material; Above room temperature; Element doping; Fe 3+; Fe3+XGeTe2film; Orbitals; TC tunability; Tunabilities; Tunables; Two-dimensional, Room temperature
Department/Centre: Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited: 16 Sep 2022 08:57
Last Modified: 16 Sep 2022 08:57
URI: https://eprints.iisc.ac.in/id/eprint/76544

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