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MA: Fachverband Magnetismus

MA 59: Posters Magnetism III

MA 59.23: Poster

Freitag, 20. März 2020, 09:00–12:00, P2/EG

Magnetic structure of Pd/Fe/Ir(111) islands confined by a ferromagnet — •Kathrin Raeker, Jonas Spethmann, Elena Y. Vedmedenko, and Roland Wiesendanger — Departement of Physics, University of Hamburg, Hamburg, Germany

We have employed stochastic Landau-Lifshitz-Gilbert spin dynamics calculations as well as Monte Carlo simulations to study the magnetic structure in laterally confined Pd/Fe/Ir(111) islands interfacing to Co/Fe/Ir(111). Monolayers of Co on Fe/Ir(111) show a strong ferromagnetic signature, whereas ultrathin films of Pd/Fe/Ir(111) form spin spirals at zero magnetic field and skyrmions at finite perpendicular fields [1]. While free-standing Fe/Ir(111) islands have been explored theoretically and experimentally [2], the influence of the interfacing of Co on the magnetic structure of spin spirals in Pd/Fe/Ir(111) is not known yet.

In the field-free regime, we find a strong coupling of the wave vector of the magnetic spiral with the close-packed edges of Fe nanostructures with the spin spiral running perpendicular to the closed-packed edge. If the island is interfaced by Co, the spin spiral is oriented along the island’s rim. These numerical findings can be explained by analytical considerations of the spatially dependent energy of the spin texture, and opens new possibilities in the engineering of magnetization states in laterally confined nanostructures.

[1] N. Romming et al., Science 341, 636 (2013).

[2] J. Hagemeister et al., Phys. Rev. Lett. 117, 207202 (2016).