Stripe width and non-local domain walls in the two-dimensional Dipolar Frustrated Ising Ferromagnet

TL;DR

This paper introduces a new type of non-localized, non-monotonic magnetic domain wall in a 2D dipolar frustrated Ising model, supported by experimental evidence in ultrathin magnetic films, with stripe width behavior near Curie temperature.

Contribution

It reveals a novel non-localized domain wall in a 2D dipolar Ising model and demonstrates its experimental presence in ultrathin magnetic films, linking theory and experiment.

Findings

Discovery of non-localized, non-monotonic domain walls.

Stripe width decreases with temperature, approaching a finite value.

Agreement between experimental results and mean-field theory predictions.

Abstract

We describe a novel type of magnetic domain wall which, in contrast to Bloch or Neel walls, is non-localized and, in a certain temperature range, non-monotonic. The wall appears as the mean-field solution of the two-dimensional ferromagnetic Ising model frustrated by the long-ranged dipolar interaction. We provide experimental evidence of this wall delocalization in the stripe-domain phase of perpendicularly magnetized ultrathin magnetic films. In agreement with experimental results, we find that the stripe width decreases with increasing temperature and approaches a finite value at the Curie-temperature following a power law. The same kind of wall and a similar temperature dependence of the stripe width is expected in the mean-field approximation of the two-dimensional Coulomb frustrated Ising ferromagnet.