Regensburg 2022 – scientific programme

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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur

KFM 23: Skyrmions 2 (joint session MA/KFM)

KFM 23.4: Talk

Thursday, September 8, 2022, 10:15–10:30, H37

Antiskyrmions in B20-type FeGe — •Nikolai S. Kiselev¹, Fengshan Zheng^2,3, Luyan Yang², Vladyslav M. Kuchkin¹, Filipp N. Rybakov^4,5, Stefan Blügel¹, and Rafal E. Nikolai² — ¹Peter Grünberg Institute and Institute for Advanced Simulation, Forschungszentrum Jülich and JARA, 52425 Jülich, Germany — ²Le Brandst. 1 — ³Spin-X Institute, School of Physics and Optoelectronics, State Key Laboratory of Luminescent Materials and Devices, Guangdong-Hong Kong-Macao Joint Laboratory of Optoelectronic and Magnetic Functional Materials, South China University of Technology, Guangzhou 511442, China — ⁴Department of Physics and Astronomy, Uppsala University, SE-75120 Uppsala, Sweden — ⁵Department of Physics, KTH-Royal Institute of Technology, SE-10691 Stockholm, Sweden

We report the highly reproducible observations of statically stable antiskyrmion [1] -- skyrmion antiparticle in thin plates of B20-type FeGe chiral magnet where only skyrmions were observed earlier. Using Lorents TEM and electron holography, we showed that skyrmions and antiskyrmions could coexist in a wide range of fields and temperatures. These findings are entirely consistent with micromagnetic simulations and prior theoretical studies of two-dimensional systems [2]. The mechanism of antiskyrmion stability, nucleation, and annihilation with ordinary skyrmions is discussed in detail.

[1] F. Zheng et al., Nat. Phys. (2022) accepted.

[2] V. M. Kuchkin, N. S. Kiselev, Phys. Rev. B 101, 064408 (2020).