Bubble and Skyrmion Crystals in Frustrated Magnets with Easy-Axis Anisotropy

Abstract

We clarify the conditions for the emergence of multiple-$\mathbf{Q}$ structures out of lattice and easy-axis spin anisotropy in frustrated magnets. By considering magnets whose exchange interaction has multiple global minima in momentum space, we find that both types of anisotropy stabilize triple-$\mathbf{Q}$ orderings. Moderate anisotropy leads to a magnetic field-induced skyrmion crystal, which evolves into a bubble crystal for increasing spatial or spin anisotropy. The bubble crystal exhibits a quasi-continuous (devil's staircase) temperature dependent ordering wave-vector, characteristic of the competition between frustrated exchange and strong easy-axis anisotropy.

9 pages, 10 figures

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• Spontaneous Skyrmion Ground States in Magnetic Metals
• Scalar spin chirality and quantum Hall effect on a triangular lattice
• Ginzburg-Landau theory for skyrmions in inversion-symmetric magnets with competing interactions
• Multiple-Q Instability by (d-2)-dimensional Connections of Fermi Surfaces
• Phases of triangular lattice antiferromagnet near saturation

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