Theory of magnetic vortex crystals induced by electric dipole interactions

TL;DR

This paper proposes a physical mechanism where electric dipole interactions induce topological spin textures, such as skyrmions, in magnetic materials, supported by Monte Carlo simulations of a coupled spin-lattice model.

Contribution

It introduces a new mechanism involving electric dipole interactions for stabilizing topological spin textures in magnetic materials.

Findings

Electric dipole interactions stabilize noncollinear spin textures.

Monte Carlo simulations support the proposed mechanism.

Topological spin textures can be realized in thin-plate magnetic samples.

Abstract

Recent Lorentz transmission electron microscopy experiments have revealed a variety of noncollinear spin textures including topological magnetisms such as skyrmions, biskyrmions and multiple skyrmions in thin-plate magnetic samples of e.g., perovskite manganites and hexaferrites whose crystal structures originally have spatial inversion symmety. Motivated by these experiments, we investigate a spin-lattice coupled model involving both magnetic and electric dipole interactions by the Monte Carlo technique based on the stochastic cut-off method and propose a physical mechanism for realizing topological spin textures in which the electric dipole interaction plays a key role. This mechanism is ubiquitous that stabilizes noncollinear and topological spin textures in thin-plate samples of magnetic materials.