Bubble and skyrmion crystals in frustrated magnets with easy-axis anisotropy
Bubble and skyrmion crystals in frustrated magnets with easy-axis anisotropy
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DOI：
10.1103/physrevb.93.184413
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发表时间：
2016-05-12
影响因子：
3.7
通讯作者：
Batista, Cristian D.
中科院分区：
文献类型：
--
作者：
Hayami, Satoru;Lin, Shi-Zeng;Batista, Cristian D.
我们阐明了出现多Q结构的晶格和易轴自旋各向异性的阻挫磁体的条件。通过考虑磁体的交换相互作用在动量空间中具有多个全局最小值，我们发现，这两种类型的各向异性稳定三Q序。适度的各向异性导致磁场诱导的skyrmion晶体，其演变成气泡晶体以增加空间和自旋各向异性。气泡晶体表现出准连续（魔鬼的楼梯）的温度依赖的有序波矢量，阻挫交换和强易轴各向异性之间的竞争的特点。
We clarify the conditions for the emergence of multiple-Qstructures 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-Q orderings. Moderate anisotropy leads to a magnetic-field-induced skyrmion crystal, which evolves into a bubble crystal for increasing spatial and spin anisotropy. The bubble crystal exhibits a quasicontinuous (devil's staircase) temperature-dependent ordering wave vector, characteristic of the competition between frustrated exchange and strong easy-axis anisotropy.