Journal Article

FZJ-2024-02507

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Large‐Area Synthesis of Ferromagnetic Fe 5− x GeTe 2 /Graphene van der Waals Heterostructures with Curie Temperature above Room Temperature

Lv, H. (Corresponding author) ; da Silva, A. ; Figueroa, A. I. ; Guillemard, C. ; Aguirre, I. F. ; Camosi, L. ; Aballe, L. ; Valvidares, M. ; Valenzuela, S. O. ; Schubert, J.FZJ* ; Schmidbauer, M. ; Herfort, J. ; Hanke, M.FZJ* ; Trampert, A. ; Engel-Herbert, R. ; Ramsteiner, M. ; Lopes, J. M. J.

2023
Wiley-VCH Weinheim

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Please use a persistent id in citations: doi:10.1002/smll.202302387  doi:10.34734/FZJ-2024-02507

Abstract: Van der Waals (vdW) heterostructures combining layered ferromagnets and other 2D crystals are promising building blocks for the realization of ultracompact devices with integrated magnetic, electronic, and optical functionalities. Their implementation in various technologies depends strongly on the development of a bottom-up scalable synthesis approach allowing for realizing highly uniform heterostructures with well-defined interfaces between different 2D-layered materials. It is also required that each material component of the heterostructure remains functional, which ideally includes ferromagnetic order above room temperature for 2D ferromagnets. Here, it is demonstrated that the large-area growth of Fe5−xGeTe2/graphene heterostructures is achieved by vdW epitaxy of Fe5−xGeTe2 on epitaxial graphene. Structural characterization confirms the realization of a continuous vdW heterostructure film with a sharp interface between Fe5−xGeTe2 and graphene. Magnetic and transport studies reveal that the ferromagnetic order persists well above 300 K with a perpendicular magnetic anisotropy. In addition, epitaxial graphene on SiC(0001) continues to exhibit a high electronic quality. These results represent an important advance beyond nonscalable flake exfoliation and stacking methods, thus marking a crucial step toward the implementation of ferromagnetic 2D materials in practical applications.

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Contributing Institute(s):

1. Gehirn & Verhalten (INM-7)
2. Halbleiter-Nanoelektronik (PGI-9)

Research Program(s):

1. 5254 - Neuroscientific Data Analytics and AI (POF4-525) (POF4-525)

Appears in the scientific report 2024

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Database coverage:
; ; ; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; DEAL Wiley ; Essential Science Indicators ; IF >= 10 ; JCR ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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