SKM 2023 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 23: Poster Magnetism I

MA 23.49: Poster

Dienstag, 28. März 2023, 17:00–19:00, P1

Demistifying exchange mechanisms in the 2D FenGeTe2 family through Wannierization — •Soheil Ershadrad, Sukanya Ghosh, and Biplab Sanyal — Uppsala Univeristy, Uppsala, Sweden

The FenGeTe2 (n=3,4,5) family of 2D ferromagnets features near-room temperature ferromagnetism, making them promising for use in spintronic devices. In these crystals, a metallic film of FenGe is sandwiched between two layers of Te, separated by a van der Waals (vdW) gap. Due to their complex structures, the physics behind their exotic magnetic behavior is not well understood. Using density functional theory, we investigated the magnetic properties of the FenGeTe2 family. Through the projection of Bloch states into Wannier functions, the orbital resolved Heisenberg exchange parameters based on the tight-binding hopping parameters were determined. Based on the extracted hopping parameters, we investigate exchange mechanisms and explain the differences in exchange interactions. Our calculations indicate that the relative position of Ge with respect to Fe atoms has a significant impact on the strength of the exchange, resulting in a strong short-range indirect exchange in the FenGeTe2 structures along with a long-ranged RKKY type of interaction.