Magnetic bubble crystal in tetragonal magnets
arXiv:2305.08333 · doi:10.1103/PhysRevB.108.024426
Abstract
A magnetic bubble crystal is a two-dimensional soliton lattice consisting of multiple spin density waves similar to a magnetic skyrmion crystal. Nevertheless, the emergence of the bubble crystal with a collinear spin texture is rare compared to that of the skyrmion crystal with a noncoplanar spin texture. Here we theoretically report the stabilization mechanisms of the bubble crystal in tetragonal magnets. By performing numerical calculations based on an efficient steepest descent method for an effective spin model with magnetic anisotropy and multiple spin interactions in momentum space on a two-dimensional square lattice, we construct magnetic field-temperature phase diagrams for various sets of model parameters. We find that the bubble crystal is stabilized at finite temperatures near the skyrmion crystal by an easy-axis anisotropic two-spin interaction. Through a detailed analysis, we also show that the high-harmonic wave-vector interaction and the biquadratic interaction play important roles in the stability of the bubble crystal. Our results indicate a close relationship between the bubble crystal and the skyrmion crystal in terms of the stabilization mechanisms, which suggests the possibility of the bubble crystal in the skyrmion-hosting materials by controlling the easy-axis magnetic anisotropy through external and/or chemical pressure.
arXiv comment11 pages, 10 figures
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- Exploring topological spin order by inverse Hamiltonian design: A new stabilization mechanism for square skyrmion crystals
- Checkerboard bubble lattice formed by octuple-period quadruple- spin density waves
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- Thermodynamic theory of square skyrmion lattice in tetragonal frustrated antiferromagnets
- Effects of crystal field and momentum-based frustrated exchange interactions on multiorbital square skyrmion lattice