Ferromagnetic Liquid Thin Films Under Applied Field

Details Ferromagnetic Liquid Thin Films Under Applied Field Ferromagnetic Liquid Thin Films Under Applied Field

1999-11-12

arxiv.org/abs/cond-mat/9911202v1

Physics

Condensed Matter

Soft Condensed Matter

10 pages, 4 figures, Submitted to Phys. Rev. E

Scientific paper

10.1103/PhysRevE.61.4171

Theoretical calculations, computer simulations and experiments indicate the possible existence of a ferromagnetic liquid state, although definitive experimental evidence is lacking. Should such a state exist, demagnetization effects would force a nontrivial magnetization texture. Since liquid droplets are deformable, the droplet shape is coupled with the magnetization texture. In a thin-film geometry in zero applied field, the droplet has a circular shape and a rotating magnetization texture with a point vortex at the center. We calculate the elongation and magnetization texture of such ferromagnetic thin film liquid droplet confined between two parallel plates under a weak applied magnetic field. The vortex stretches into a domain wall and exchange forces break the reflection symmetry. This behavior contrasts qualitatively and quantitatively with the elongation of paramagnetic thin films.

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