Inertial Dynamics of a Skymeron
Abstract
Topological spin textures in antiferromagnets inherit the compensated magnetic order of the host material, resulting for skyrmions in the suppression of the skyrmion Hall effect and enabling ultrafast dynamics that make them attractive for low-power spintronic devices. In intrinsic antiferromagnets, the two sublattices are identical, but synthetic antiferromagnets offer additional control mechanisms by enabling independent tuning of the properties of two ferromagnetic layers. Analogous to a ferrimagnet, the total magnetic moment can be adjusted by compensating the two-layer moments. Here, we demonstrate that tuning the effective magnetic anisotropy difference between the two layers drives a spin-flop transition where one layer reorients and thus stabilizes an orthogonal configuration with one layer oriented along the out-of-plane direction and the other in-plane. In this transition, an antiferromagnetic skyrmion undergoes a homotopic reconfiguration into a complex spin texture comprising a skyrmion coupled to an in-plane bimeron. Element-specific X-ray microscopy resolves this texture layer by layer: one hosts an out-of-plane skyrmion coupled to an in-plane bimeron in the other. We refer to this previously unexplored three-dimensional spin texture as a skymeron. By using time-resolved pump-probe X-ray microscopy, we discover unique polarity ,dependent dynamics during current pulses: a short post-pulse inertia-like continuation of the motion, and a slower return towards the pinned initial state. Micromagnetic simulations reveal that the inertia-like propagation originates from the finite-time relaxation of reorientation of the skymeron. Our results establish layer-selective anisotropy engineering as a route to uncharted composite spin textures with internal dynamical degrees of freedom, not possible in conventional antiferromagnets with identical sublattices.
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BibTeX
@misc{bhukta2026inertial,
title = {{Inertial Dynamics of a Skymeron}},
author = {Mona Bhukta and Duc Minh Tran and Kilian Leutner and Takaaki Dohi and Nikolai S. Kiselev and Filipp N. Rybakov and Olle Eriksson and Fabian Kammerbauer and Sebastian Wintz and Markus Weigand and Hendrik Ohldag and Maria-Andromachi Syskaki and Robin Tietgen and Edoardo Mangini and Sabrina Kerber and Thibaud Denneulin and Joseph Vimal Vas and Rafal E. Dunin-Borkowski and Bastian Pfau and Oleg A. Tretiakov and Robert Frömter and Mathias Kläui},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.01339},
eprint = {2610.01339},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.01339},
note = {CC BY-NC-ND 4.0},
}
RIS
TY - UNPB
TI - Inertial Dynamics of a Skymeron
AU - Mona Bhukta
AU - Duc Minh Tran
AU - Kilian Leutner
AU - Takaaki Dohi
AU - Nikolai S. Kiselev
AU - Filipp N. Rybakov
AU - Olle Eriksson
AU - Fabian Kammerbauer
AU - Sebastian Wintz
AU - Markus Weigand
AU - Hendrik Ohldag
AU - Maria-Andromachi Syskaki
AU - Robin Tietgen
AU - Edoardo Mangini
AU - Sabrina Kerber
AU - Thibaud Denneulin
AU - Joseph Vimal Vas
AU - Rafal E. Dunin-Borkowski
AU - Bastian Pfau
AU - Oleg A. Tretiakov
AU - Robert Frömter
AU - Mathias Kläui
PY - 2026
DA - 2026/10/01
PB - arXiv
DO - 10.48550/arxiv.2610.01339
UR - https://arxiv.org/abs/2610.01339
AB - Topological spin textures in antiferromagnets inherit the compensated magnetic order of the host material, resulting for skyrmions in the suppression of the skyrmion Hall effect and enabling ultrafast dynamics that make them attractive for low-power spintronic devices. In intrinsic antiferromagnets, the two sublattices are identical, but synthetic antiferromagnets offer additional control mechanisms by enabling independent tuning of the properties of two ferromagnetic layers. Analogous to a ferrimagnet, the total magnetic moment can be adjusted by compensating the two-layer moments. Here, we demonstrate that tuning the effective magnetic anisotropy difference between the two layers drives a spin-flop transition where one layer reorients and thus stabilizes an orthogonal configuration with one layer oriented along the out-of-plane direction and the other in-plane. In this transition, an antiferromagnetic skyrmion undergoes a homotopic reconfiguration into a complex spin texture comprising a skyrmion coupled to an in-plane bimeron. Element-specific X-ray microscopy resolves this texture layer by layer: one hosts an out-of-plane skyrmion coupled to an in-plane bimeron in the other. We refer to this previously unexplored three-dimensional spin texture as a skymeron. By using time-resolved pump-probe X-ray microscopy, we discover unique polarity ,dependent dynamics during current pulses: a short post-pulse inertia-like continuation of the motion, and a slower return towards the pinned initial state. Micromagnetic simulations reveal that the inertia-like propagation originates from the finite-time relaxation of reorientation of the skymeron. Our results establish layer-selective anisotropy engineering as a route to uncharted composite spin textures with internal dynamical degrees of freedom, not possible in conventional antiferromagnets with identical sublattices.
ER -