Berlin 2024 – scientific programme

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MA: Fachverband Magnetismus

MA 19: Surface Magnetism

MA 19.3: Talk

Tuesday, March 19, 2024, 10:00–10:15, EB 407

Exploring the complex magnetism of hexagonal Mn mono- and double-layers on Ir(111) — •Mara Gutzeit, Tim Drevelow, Soumyajyoti Haldar, and Stefan Heinze — Institute of Theoretical Physics and Astrophysics, University of Kiel, Leibnizstraße 15, 24098 Kiel, Germany

Ultrathin transition-metal films can host complex magnetic states with intriguing properties due to competing magnetic interactions. Prominent examples are antiferromagnetic (AFM) hexagonal Mn monolayers (MLs) on Re(0001) exhibiting depending on the Mn stacking either the RW-AFM or the 3Q state as the magnetic ground state [1], a double layer (DL) of Mn on the W(110) surface which holds a conical spin spiral state [2] or a Mn DL on W(001) for which the moments of the interface Mn atoms even vanish [3]. Here, employing density functional theory calculations we calculate the energy dispersion of spin spirals of both an AFM hexagonal Mn ML and a DL on Ir(111) in order to investigate their magnetic phase space. While for the ML the Néel state turns out to be energetically lowest, the situation becomes more involved for the Mn DL due to the possibility of spin spirals propagating in two interacting magnetic layers. We show that this system is characterized by a strong AFM interlayer exchange coupling giving rise to a variety of complex magnetic states that govern the low-energy regime.

[1] Spethmann et al. PRL 124, 227203 (2020)

[2] Yoshida et al. PRL 108, 087205 (2012)

[3] Meyer et al. PRR 2, 012075(R) (2020)

Keywords: Magnetic double layers; Antiferromagnetism; Heisenberg exchange interaction; Density functional theory; Spin spirals