SKM 2023 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 12: Skyrmions II

MA 12.4: Vortrag

Dienstag, 28. März 2023, 10:15–10:30, HSZ 02

Room temperature stabilization of skyrmionic spin textures in synthetic antiferromagnets — •Mona Bhukta, Takaaki Dohi, M-A. Syskaki, Robert Frömter, and Mathias Kläui — Institut für Physik, Johannes Gutenberg-Universität Mainz, Staudingerweg 7, 55128 Mainz, Germany

Magnetic skyrmions [1] are twisted spin configurations, which show a non-zero skyrmion Hall angle when driven by current due to their topological nature[2], which is detrimental for applications. Skyrmions in synthetic antiferromagnet(SAFs), suppress this effect owing to an overall zero topological charge. Recent observations of skyrmions in SAFs have opened the possibility for using skyrmions as a candidate for logic operations in data storage devices [3]. Here, we investigate different, more exotic spin textures beyond skyrmions in a SAF consisting of CoFeB/Ir/CoFeB multilayers by using scanning electron microscopy with polarization analysis (SEMPA). The surface sensitivity of SEMPA is especially effective on SAFs enabling us to investigate the topological spin textures even in a fully compensated composition. We report merons and antimerons in the SAF that are stable at zero magnetic fields and room temperature. Micromagnetic simulations of the investigated SAF stacks have been carried out to understand the way of stabilization of these exotic spin textures as well as to explore the possible emergence of three-dimensional (3D) spin structures in the SAF multilayer system. [1] K. Everschor-Sitte et al., J. Appl. Phys. 124, 240901 (2018). [2] K. Litzius et al., Nat. Phys. 13, 170 (2017). [3] T. Dohi et al, Nat. Commun. 10, 5153 (2019)