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- Title
Interfacial engineering of ferromagnetism in wafer-scale van der Waals Fe<sub>4</sub>GeTe<sub>2</sub> far above room temperature.
- Authors
Wang, Hangtian; Lu, Haichang; Guo, Zongxia; Li, Ang; Wu, Peichen; Li, Jing; Xie, Weiran; Sun, Zhimei; Li, Peng; Damas, Héloïse; Friedel, Anna Maria; Migot, Sylvie; Ghanbaja, Jaafar; Moreau, Luc; Fagot-Revurat, Yannick; Petit-Watelot, Sébastien; Hauet, Thomas; Robertson, John; Mangin, Stéphane; Zhao, Weisheng
- Abstract
Despite recent advances in exfoliated vdW ferromagnets, the widespread application of 2D magnetism requires a Curie temperature (Tc) above room temperature as well as a stable and controllable magnetic anisotropy. Here we demonstrate a large-scale iron-based vdW material Fe4GeTe2 with the Tc 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 Tc, 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 Fe4GeTe2 in spintronics, which may open opportunities for room-temperature application of all-vdW spintronic devices. Applications of van der Waals magnetic systems are typically hampered by the low Curie temperature of van der Waals magnets. Here, Wang et al use molecular beam epitaxy to grow large films of Fe4GeTe2 with Curie temperatures over 500 K, and the film's magnetic anisotropy can be tuned arbitrarily by controlling stoichiometry.
- Subjects
FERROMAGNETISM; MOLECULAR beam epitaxy; MAGNETIC anisotropy; MAGNETIC control; PHOTOELECTRON spectroscopy
- Publication
Nature Communications, 2023, Vol 14, Issue 1, p1
- ISSN
2041-1723
- Publication type
Article
- DOI
10.1038/s41467-023-37917-8