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MA: Fachverband Magnetismus

MA 29: Spin-Dependent Phenomena in 2 D

MA 29.14: Talk

Wednesday, March 20, 2024, 18:30–18:45, EB 202

Magnetic ordering in weakly coupled van der Waals systems — •Karel Carva and Krishna K. Pokhrel — Charles University, Faculty of Mathematics and Physics, DCMP, Ke Karlovu 5, 121 16 Prague 2, Czech Republic

Magnetic van der Waals materials exhibit promising potential for high-tech magnetic applications in nanostructures [1]. Their weak interlayer coupling leads to magnetic behavior different from the more explored cases of isotropic bulk-like exchange or the ideal 2D (monolayer) limit [2]. Here we examine general features of finite temperature magnetic order in this regime by atomistic spin dynamics methods. The method is applied to a particularly interesting system from this class, VI₃. Its anisotropy was reproduced by first-principles calculations only if lattice distortions present at its low temperature phases were taken into account [3]. The calculations also revealed an exceptionally large orbital momentum on V atoms; these findings are compared to recent measurements based on the x-ray magnetic circular dichroism [4]. Employing calculated exchange interactions we study how is the Curie temperature affected by interlayer coupling in this system.

[1] K. Burch, et al., Nature 63 (2018) 47

[2] V. Y. Irkhin, A. A. Katanin, and M. I. Katsnelson, Phys. Rev. B 60 (1999) 1082

[3] L. M. Sandratskii and K. Carva, Phys. Rev. B 103 (2021) 214451

[4] D. Hovančík et al., Nano Lett. 23 (2023) 1175

Keywords: 2D magnetism; ab initio calculations