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MA: Fachverband Magnetismus

MA 29: Spin-Dependent Phenomena in 2 D

MA 29.2: Talk

Wednesday, March 20, 2024, 15:15–15:30, EB 202

An Effective Magnetic Model for FePS3 — •Minsu Ghim, Tae Yun Kim, and Cheol-Hwan Park — Department of Physics and Astronomy, Seoul National University, Seoul, Korea

Two-dimensional (2D) magnetism has drawn attention due to its properties distinct from those in three-dimensional magnetic systems. One of the most notable features is the Mermin-Wagner theorem, which states that with isotropic Heisenberg interactions, long-range magnetic order cannot exist at finite temperatures in a 2D system. Despite the Mermin-Wagner theorem, long-range magnetic order can still arise due to magnetic anisotropy. To understand 2D magnetism, extensive studies have been focused on establishing a model Hamiltonian for various materials. It is essential to develop an accurate magnetic energy model not only to characterize the ground state but also to explain phase transitions or low-energy excitations such as magnons. In this study, we focus on the magnetism of single-layer FePS3. We calculate the total energies and magnetic moments of various spin configurations. We conduct a quantitative analysis of the exchange interactions and discuss how FePS3 achieves its known ground state, the zigzag-type antiferromagnetism. [1, 2]

[1] T. Y. Kim, and C.-H. Park, Magnetic Anisotropy and Magnetic ordering of Transition-Metal Phosphorus Trisulfides, Nano Lett. 2021, 21, 23, 10114-10121 [2] M. Ghim, T. Y. Kim, C.-H. Park, unpublished

Keywords: FePS3; exchange; magnetic; model; two-dimension