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Interfacial engineering of ferromagnetism in wafer-scale van der Waals Fe(4)GeTe(2) far above room temperature

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)...

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Detalles Bibliográficos
Autores principales: 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, Nie, Tianxiao
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10148834/
https://www.ncbi.nlm.nih.gov/pubmed/37120587
http://dx.doi.org/10.1038/s41467-023-37917-8
Descripción
Sumario: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.