Novel Topological Weyl Semimetallic Phase in layered materials: Fe&lt;sub&gt;2&lt;/sub&gt;Sn, Fe&lt;sub&gt;3&lt;/sub&gt;Sn

Ghimire, Madhav Prasad; Karki, Bishnu; Belbase, Bishnu Prasad

doi:10.3390/iocc_2020-07719

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“…Figure 4d shows a contour plot of ΔR yx ð ± 3 TÞ ¼ R yx ðþ3 TÞ À R yx ðÀ3 TÞ on t-T plane; its sign reversal occurs in close proximity to the THE region (surrounded by dashed lines). According to recent band structure calculation 29 , Fe 3 Sn is classified as a magnetic Weyl semimetal with Weyl nodes 30 near the Fermi level. The Tinduced shift of the Fermi level and the resulting change in the intrinsic AHE contribution may play a role in the T-induced sign reversal of AHE.…”

Section: Resultsmentioning

confidence: 99%

Tuning scalar spin chirality in ultrathin films of the kagome-lattice ferromagnet Fe3Sn

et al. 2021

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Non-coplanar spin textures with finite scalar spin chirality can be artificially induced at surfaces and interfaces through the interfacial Dzyaloshinskii-Moriya interaction. However, stabilizing a proper magnetic skyrmion crystal via this route remains elusive. Here, using an epitaxial bilayer of platinum and geometrically frustrated kagome-lattice ferromagnet Fe3Sn, we show the possible formation of a two-dimensional skyrmion crystal under well-regulated Fe3Sn thickness conditions. Magnetization measurements reveal that the magnetic anisotropy is systematically varied from an inherent in-plane type to a perpendicular type with the thickness reduction. Below approximately 0.5 nm, we clearly detect a topological Hall effect that provides evidence for finite scalar spin chirality. Our topological Hall effect analysis, combined with theoretical simulations, not only establishes its interfacial Dzyaloshinskii-Moriya interaction origin, but also indicates the emergence of a stable skyrmion crystal phase, demonstrating the potential of kagome-lattice ferromagnets in spin chirality engineering using thin-film nanostructures.

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Section: Resultsmentioning

confidence: 99%