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Interlayer engineering of Fe3GeTe2: From 3D superlattice to 2D monolayer
Yecun Wu1,2,3, Bai Yang Wang1,3, Yijun Yu4
1Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park, CA 94025.
Summary
Interlayer engineering of magnetic van der Waals (vdW) crystals like Fe3GeTe2 (FGT) using quaternary ammonium cations creates 3D superlattices and protected 2D layers. This method enhances magnetic properties and sample stability for advanced spintronic applications.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Nanotechnology
Background:
- Atomically thin van der Waals (vdW) crystals exhibit ferromagnetism, expanding magnetic thin film research.
- Mechanical exfoliation methods for vdW crystals face challenges like low yield and degradation, hindering magnetism studies.
- Forming magnetic superlattices in vdW crystals is difficult, limiting investigations into interlayer magnetic interactions.
Purpose of the Study:
- To develop a novel interlayer engineering strategy for magnetic vdW crystals.
- To create both 3D vdW superlattices and 2D vdW monolayers of Fe3GeTe2 (FGT) using intercalation.
- To investigate the impact of intercalation on the magnetic properties and stability of FGT.
Main Methods:
- Intercalation of quaternary ammonium cations into the vdW spacing of Fe3GeTe2 (FGT).
- Controlled variation of intercalant amount to form either 3D vdW superlattices or 2D vdW few layers.
- Characterization of magnetic properties, including critical behavior, coercivity, domain wall size, and ferromagnetic transition temperature (Tc).
Main Results:
- The FGT superlattice exhibited strong 3D critical behavior, with reduced coercivity and larger domain walls due to co-engineered anisotropy, exchange interaction, and electron doping.
- Over-intercalation yielded 2D vdW few layers capped with organic molecules, enhancing the ferromagnetic transition temperature (Tc).
- The organic capping provided substantial protection against degradation, enabling large-scale FGT ink preparation in ambient conditions.
Conclusions:
- Interlayer engineering via cation intercalation offers a versatile strategy for fabricating magnetic vdW heterostructures.
- The method allows for tunable magnetic properties and enhanced stability in both 3D superlattices and 2D vdW materials.
- This approach overcomes limitations of mechanical exfoliation, paving the way for practical applications of magnetic vdW crystals.
