Article Dans Une Revue Nature Communications Année : 2023

Interfacial engineering of ferromagnetism in wafer-scale van der Waals Fe4GeTe2 far above room temperature

Peng Li
Héloïse Damas
Sylvie Migot
Jaâfar Ghanbaja
Luc Moreau
Thomas Hauet
Weisheng Zhao

Résumé

Abstract Despite recent advances in exfoliated vdW ferromagnets, the widespread application of 2D magnetism requires a Curie temperature (T c ) above room temperature as well as a stable and controllable magnetic anisotropy. Here we demonstrate a large-scale iron-based vdW material Fe 4 GeTe 2 with the T c reaching ~530 K. We confirmed the high-temperature ferromagnetism by multiple characterizations. Theoretical calculations suggested that the interface-induced right shift of the localized states for unpaired Fe d electrons is the reason for the enhanced T c , which was confirmed by ultraviolet photoelectron spectroscopy. Moreover, by precisely tailoring Fe concentration we achieved arbitrary control of magnetic anisotropy between out-of-plane and in-plane without inducing any phase disorders. Our finding sheds light on the high potential of Fe 4 GeTe 2 in spintronics, which may open opportunities for room-temperature application of all-vdW spintronic devices.

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hal-04106198 , version 1 (25-05-2023)

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Hangtian Wang, Haichang Lu, Zongxia Guo, Ang Li, Peichen Wu, et al.. Interfacial engineering of ferromagnetism in wafer-scale van der Waals Fe4GeTe2 far above room temperature. Nature Communications, 2023, 14 (1), pp.2483. ⟨10.1038/s41467-023-37917-8⟩. ⟨hal-04106198⟩
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