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MA: Fachverband Magnetismus

MA 46: Poster II

MA 46.13: Poster

Thursday, March 21, 2024, 15:00–18:00, Poster C

Room-Temperature Skyrmions in Ir/Fe/Co/Pt Multilayers Coupled to Co/Pt Multilayers — •Joe Sunny, Timo Schmidt, Tamer Karaman, and Manfred Albrecht — Institute of Physics, University of Augsburg, D-86159 Augsburg, Germany

Magnetic skyrmions are topologically protected swirling magnetic spin structures which can be stabilized by Dzyalonshinskii-Moriya interactions (DMI). In recent years, considerable research efforts have been dedicated to stabilizing and manipulating skyrmions at room temperature in multilayer systems as these promise applications in skyrmion-based topological spintronics. The system studied combined of a skyrmion hosting multilayer of Ir/Fe/Co/Pt and a ferromagnetic layer of Co/Pt with perpendicular easy axis of magnetization separated by a non-magnetic spacer layer of Cu. The skyrmion layer hosts skyrmions of Néel-type stabilized by the interlayer DMI from the Ir/Fe and Co/Pt interfaces[1]. The magnetic domains formed in the skyrmion hosting layer are coupled to the ferromagnetic layer via the Cu spacer by Ruderman-Kittel-Kasuya-Yosida (RKKY) interaction. From the Lorentz transmission electron microscope (LTEM) imaging the spin objects are observed to be not entirely Néel-type but also have a Bloch-type contrast. To study if the skyrmions from the underlying layer are completely imprinted onto the top Co/Pt layer, X-ray magnetic circular dichroism (XMCD) measurements were performed.

References

1.Anjan Soumyanarayanan et.al, Nature Mater 16, 898*904 (2017).

Keywords: Néel -type; Bloch-type; Dzyalonshinskii-Moriya interactions (DMI); Lorentz transmission electron microscope (LTEM); X-ray magnetic circular dichroism (XMCD)