AI Article Synopsis
- The study explores how the ferromagnetic properties of the van der Waals (vdW) crystal FeGeTe change with layer thickness, revealing important insights for spintronics.
- As the layers thin, the material transitions from soft ferromagnetism in bulk to hard ferromagnetism in bilayers, with significant changes in magnetoresistance and anomalous Hall effect (AHE).
- In monolayer flakes, the magnetic behavior shifts to spin-glass-like due to localization effects, emphasizing the potential for tuning magnetotransport properties in these materials for advanced technologies.
Article Abstract
Realization of ferromagnetism in the two-dimensional (2D) van der Waals (vdW) crystals opens up a vital route to understand the magnetic ordering in the 2D limit and to design novel spintronics. Here, we report enriched layer-number-dependent magnetotransport properties in the vdW ferromagnet FeGeTe. By studying the magnetoresistance and anomalous Hall effect (AHE) in nanoflakes with thicknesses down to monolayer, we demonstrate that while the bulk crystals exhibit soft ferromagnetism with an in-plane magnetic anisotropy, hard ferromagnetism develops upon thinning, and a perpendicular eas-axis anisotropy is realized in bilayer flakes, which is accompanied by a pronounced enhancement of AHE because of extrinsic mechanisms. For the monolayer flakes, the hard ferromagnetism is replaced by spin-glass-like behavior, in accordance with the localization effect in the 2D limit. Our results highlight the thickness-based tunability of the magnetotransport properties in the atomically thin vdW magnets that promises engineering of high-performance spintronic devices.
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| http://dx.doi.org/10.1021/acs.nanolett.2c02696 | DOI Listing |
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