Regensburg 2025 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 64: Focus Session Atomic Scale Investigation of Magnetic 2D Materials

O 64.4: Hauptvortrag

Mittwoch, 19. März 2025, 16:30–17:00, H2

Spin excitations in 2D heterostructures from realistic fermionic models — •António Costa — Center of Physics of the University of Minho, Braga, Portugal — International Iberian Nanotechnology Laboratory

Spin excitations dominate the magnetic response of ferromagnetic two-dimensional crystals. The interplay between low dimensionality, reduced symmetry and spin-orbit coupling endows spin excitations in those materials with intriguing properties, such as non-trivial topology and non-reciprocity. Moreover, spin-orbit coupling connects spin and charge degrees of freedom, opening up paths to electrical control and detection of magnetic states. I will present a microscopic description of the spin response of nanostructured materials based on Hamiltonians for itinerant fermions, derived from DFT calculations. This approach incorporates spin-orbit coupling, does not rely on postulated spin models, and can be applied to insulating or conducting 2D heterostructures, with any kind of magnetic order. I will discuss the properties of magnons in insulating and metallic van der Waals ferromagnets, as well as in 2D molecular crystals. I will also discuss the proximity effect in a heterostructure formed by a 2D ferromagnet and graphene.

Keywords: spin excitations; magnons 2D magnets; 2D magnets; van der Waals heterostructures