Abstract

In recent years, the realization of magnetic long-range order in atomically thin 2D materials has shown a big potential in spintronic applications in ultrathin magnets due to the possibility of manipulation of magnetism by external fields, strain or proximity effects in van der Waals heterostructures. Specifically, the family of metallic magnets FenGeTe2 (n=3, 4, 5) has attracted a huge attention due to their high Curie temperatures and intriguing properties. In this talk, I will review the status of this research field, highlighting our own research by ab initio density functional theory, calculations of interatomic exchange interaction parameters and Monte Carlo simulations. I will discuss the dependence of stacking sequence on magnetism in CrI3 multilayers and complex magnetism in 2D FeS2. A particular emphasis will be given on the systematic study of the electronic structure and magnetism of FenGeTe2 magnets along with some critical discussions on the importance of electron correlation with the aid of dynamical mean field theory, spin-orbit coupling and effects of transition metal doping.

[1] S. Ghosh, S. Ershadrad, V. Borisov, B. Sanyal, npj comp. mat. 2023, 9, 86-101.

[2] S. Ershadrad, S. Ghosh, D. Wang, Y. Kvashnin, B. Sanyal, J. Phys. Chem. Lett. 2022, 13, 4877-4883.

[3] S. Ghosh, S. Ershadrad, B. Sanyal, arXiv:2305.04366