High-spin orbital interactions across van der Waals gaps controlling the interlayer ferromagnetism in van der Waals ferromagnets

Abstract

We examined what interactions control the sign and strength of the interlayer coupling in van der Waals ferromagnets such as Fe3-xGeTe2, Cr2Ge2Te6, CrI3 and VI3, to find that high-spin orbital interaction across the van der Waals gaps are a key to understanding their ferromagnetism. Interlayer ferromagnetic coupling in Fe3-xGeTe2 Cr2Ge2Te6, and CrI3 is governed by the high-spin two-orbital two-electron destabilization, but that in VI3 by the high-spin four-orbital two-electron stabilization. These interactions explain a number of seemingly puzzling observations in van der Waals fer-romagnets.

arXiv comment17 pages, 11 figures

References in corpus (8)

• Discovery of intrinsic ferromagnetism in 2D van der Waals crystals
• Gate-tunable Room-temperature Ferromagnetism in Two-dimensional Fe${}_3$GeTe${}_2$
• Pressure-controlled interlayer magnetism in atomically thin CrI3
• Magnetic structure and phase stability of the van der Waals bonded ferromagnet Fe3-xGeTe2
• Electronic Correlation and Magnetism in the Ferromagnetic Metal Fe3GeTe2
• Bulk properties of van-der-Waals hard ferromagnet VI3
• Critical behavior of the van der Waals bonded ferromagnet Fe${}_{3-x}$GeTe${}_2$
• Pressure-induced huge increase of Curie temperature of the van der Waals ferromagnet VI3

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