The conformal limit for bimerons in easy-plane chiral magnets

TL;DR

This paper analyzes the existence and precise structure of bimeron solutions in a ferromagnetic model with easy-plane anisotropy, showing they are localized perturbations of Möbius maps at a scale related to the logarithm of the anisotropy parameter.

Contribution

It establishes the existence and detailed description of bimeron minimizers in an easy-plane ferromagnetic model, extending previous methods to less coercive anisotropy settings.

Findings

Bimeron solutions exist for small anisotropy parameter 

They are localized at scale /||

Solutions are perturbations of Möbius maps

Abstract

We study minimizers $\boldsymbol{m}\colon \mathbb R^2\to\mathbb S^2$ of the energy functional \begin{align*} E_\sigma(\boldsymbol{m}) = \int_{\mathbb R^2} \bigg(\frac 12 |\nabla\boldsymbol{m}|^2 +\sigma^2 \boldsymbol{ m} \cdot \nabla \times\boldsymbol{m} +\sigma^2 m_3^2 \bigg)\, dx\,, \end{align*} for $0<\sigma\ll 1$, with prescribed topological degree \begin{align*} Q(\boldsymbol{m})=\frac{1}{4\pi} \int_{\mathbb R^2}\boldsymbol{m} \cdot \partial_1 \boldsymbol{m}\times\partial_2\boldsymbol{m}\, dx =\pm 1\,. \end{align*} This model arises in thin ferromagnetic films with Dzyaloshinskii-Moriya interaction and easy-plane anisotropy, where these minimizers represent bimeron configurations. We prove their existence, and describe them precisely as perturbations of specific M\"obius maps: we establish in particular that they are localized at scale of order $1/|\ln(\sigma^2)|$. The proof follows a strategy introduced by Bernand-Mantel, Muratov and Simon (Arch. Ration. Mech. Anal., 2021) for a similar model with easy-axis anisotropy, but requires several adaptations to deal with the less coercive easy-plane anisotropy and different symmetry properties.