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Field-induced condensation of π to 2π soliton lattices in chiral magnets
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DOI：10.1038/s42005-026-02785-3.png)
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Abstract
En 中文
Chiral soliton lattices (CSLs) emerge from the competition between Dzyaloshinskii–Moriya interaction, anisotropy, and magnetic fields. While well established in monoaxial helimagnets, their role in materials with anisotropic, direction-dependent chirality remains poorly understood. Here, we report the direct observation of a crossover from π to 2π soliton lattices in the non-centrosymmetric Heusler compound Mn1.4PtSn. Combining Lorentz transmission electron microscopy, resonant elastic X-ray scattering, and micromagnetic simulations, we identify a π-CSL as the magnetic ground state—rather than the expected spiral phase—which evolves into a classical 2π-CSL under increasing out-of-plane fields. This transition is governed by an interplay between uniaxial magnetocrystalline anisotropy and magnetostatic interactions, qualitatively captured by a double sine-Gordon model. Our framework extends to materials with D2d, S4, Cnv, or Cn symmetries in the thin-film limit, providing a unifying route to engineer magnetic phase diagrams in chiral systems with implications for soliton-based spintronics and topological transport. Chiral magnets can host periodic spin textures called soliton lattices, but their formation in materials with anisotropic chirality has remained unclear. Here, the authors show that Mn1.4PtSn supports a π-soliton ground state that condenses into a 2π soliton lattice under an out-of-plane field, revealing a generic route to chiral spin textures.
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