On the nature of the magnetism in Fe3GeTe2*

Magnetic ordering in layered van der Waals materials is not only of fundamental scientific interest, but also offers a pathway to tailor magnetic properties via confinement and heterostucture engineering. Recent studies have reported both ferromagnetic and antiferromagnetic order in the quasi 2D Fe3GeTe2.[1,2] In this talk we will address these seemingly contradicting results based on first principles calculations, scanning tunneling microscopy and inelastic neutron scattering. [1] V. Y. Verchenko et al, Inorg. Chem. 54, 8598 (2015) [2] J. Yi et al, 2D Mater 4, 011005 (2017)