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MA: Fachverband Magnetismus

MA 4: Focus Session: Novel mechanisms of ferroic switching (joint session MA/FM)

MA 4.6: Vortrag

Montag, 9. März 2026, 11:45–12:00, POT/0151

E-field induced unidirectional motion of domain wall in a ferromagnet and time crystals — •Margherita Parodi^1,2, Sergey Artyukhin¹, and Maxim Mostovoy³ — ¹Quantum Materials Theory, Italian Institute of Technology, Genova, Italy — ²Physics Department, University of Genova, Italy — ³Theory of Condensed Matter, Zernike Institute for Advanced Materials, Groningen, The Netherlands

Noncollinear spin textures may break inversion symmetry and induce ferroelectric polarization, giving rise to multiferroicity. Here we study the most basic noncollinear spin texture: a domain wall in a collinear (anti)ferromagnet. The spin chirality of the domain wall is analogous to that in spiral multiferroics and likewise leads to ferroelectric polarization. Here we find that oscillating magnetic and electric fields can drive a unidirectional motion of the magnetic texture, similar to how electrons are transported by the Thouless pump. Furthermore, for certain periods of a driving field, the domain wall demonstrates complex behaviour akin to a time crystal, with the period equal to an integer multiple of the driving periods. The phenomenon arises due to a mismatch between the natural timescale of the domain wall motion and the driving field period.

Keywords: ferromagnetism; domain wall motion; time crystals; Thouless pump; antiferromagnetism