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Bubble and Skyrmion Crystals in Frustrated Magnets with Easy-Axis Anisotropy
We clarify the conditions for the emergence of multiple- 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- 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.Comment: 9 pages, 10 figure
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