SKM 2021 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 5: Posters Magnetism II
MA 5.12: Poster
Dienstag, 28. September 2021, 10:00–13:00, P
Antiskyrmions and sawtooth surface textures in an S4 symmetric magnet — Kosuke Karube1, Licong Peng1, •Jan Masell1, Xiuzhen Yu1, Fumitaka Kagawa1,2, Yoshinori Tokura1,2, and Yasujiro Taguchi1 — 1RIKEN CEMS, Wako, Japan — 2University of Tokyo, Tokyo, Japan
Magnetic skyrmions are vortex-like textures in the magnetization. By now, skyrmions are found in many systems ranging from bulk chiral magnets to thin films and monolayers. Their anti-vortex-like anti-particles, consequently dubbed "antiskyrmions", were theoretically predicted to exist in magnets with D2d or S4 symmetry [1], but were observed only in a family of D2d-symmetric Heuslers. [2]
We report the first observation of antiskyrmions in a magnet with S4 symmetry. We prepared Pd-doped Schreibersite which shows a weak uniaxial anisotropy and weak antisymmetric DMI. Thus, domain walls with opposite handedness are stabilized along two orthogonal directions. In thin films, LTEM reveals square-shaped antiskyrmions, elliptical skyrmions, and trivial bubbles, as a consequence of dipolar interactions. For thicker systems, MFM shows that the domain wall textures fractalize with sawtooth patterns. These novel patterns arise from the weak antisymmetric DMI in combination with dominant dipolar interactions, as shown by our micromagnetic simulations. [3]
[1] A.N. Bogdanov & D.A. Yablonskii, JETP 68, 101-103 (1989)
[2] A.K. Nayak et al., Nature 548, 561-566 (2017)
[3] K. Karube, L.C. Peng, J. Masell, et al., Nature Materials 20, 335-340 (2021)