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arXiv · 2510.21320

Controlling bubble and skyrmion lattice order and dynamics via stripe domain engineering in ferrimagnetic Fe/Gd multilayers

Tim Titze·Sabri Koraltan·Timo Schmidt·Mailin Matthies·Amalio Fernández-Pacheco·Dieter Suess·Manfred Albrecht·Stefan Mathias·Daniel Steil
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Abstract

Ferrimagnetic Fe/Gd multilayers host maze-like stripe domains that transform into a disordered bubble/skyrmion lattice under out-of-plane magnetic fields at ambient temperature. Femtosecond magneto-optics distinguishes these textures via their distinct coherent breathing dynamics. Crucially, applying a brief in-plane ``set'' magnetic field to the stripe state enhances both frequency and amplitude of the bubble/skyrmion lattice breathing mode. Lorentz transmission electron microscopy, magnetic force microscopy, and micromagnetic simulations reveal that this enhancement arises from field-aligned stripes nucleating a dense, near-hexagonal bubble/skyrmion lattice upon out-of-plane field application, with strong indications for a pure skyrmion lattice. Thus, modifying the initial domain configuration by in-plane fields enables precise control of coherent magnetization dynamics on picosecond to nanosecond timescales and potentially even of topology.

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Tim Titze, Sabri Koraltan, Timo Schmidt, Mailin Matthies, Amalio Fernández-Pacheco, Dieter Suess, Manfred Albrecht, Stefan Mathias, Daniel Steil. 2025-10-24. Controlling bubble and skyrmion lattice order and dynamics via stripe domain engineering in ferrimagnetic Fe/Gd multilayers. https://doi.org/10.1002/apxr.202500194

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