Mapping skyrmion stability in uniaxial lacunar spinel magnets from first principles
Mapping skyrmion stability in uniaxial lacunar spinel magnets from first principles
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DOI：
10.1103/physrevb.101.054409
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发表时间：
2019-11
影响因子：
3.7
通讯作者：
D. Kitchaev;Emily C. Schueller;A. Van der Ven
中科院分区：
文献类型：
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作者：
D. Kitchaev;Emily C. Schueller;A. Van der Ven
确定在宽温度范围内稳定体材料中磁性skyrmion相的一般原理是开发基于skyrmion的自旋电子器件的先决条件。具有式GaM 4X 8（其中M=V，Mo; X=S，Se）的腔隙尖晶石是实现这一目标的方便的案例研究，因为它们是第一批建议托管远离顺磁过渡的平衡手性skyrmions的系统中的一些。我们推导出可能在这些材料中观察到的磁相图，占所有可能的磁相互作用，并证明，skyrmion的稳定性在腔隙尖晶石是其晶体对称性的一般后果，而不是材料化学的细节。我们的研究结果是一致的，在这个空间中的所有实验报告，并表明，在特定的尖晶石化学的相图的差异是由磁晶各向异性，一个归一化因子。我们的结论是skyrmion形成在很宽的温度范围内，可以预期在所有的腔隙尖晶石，以及在广泛的单轴系统与低磁晶各向异性。
The identification of general principles for stabilizing magnetic skyrmion phases in bulk materials over wide ranges of temperatures is a prerequisite to the development of skyrmion-based spintronic devices. Lacunar spinels with the formula GaM4X8 with M=V, Mo; X=S, Se are a convenient case study towards this goal as they are some of the first bulk systems suggested to host equilibrium chiral skyrmions far from the paramagnetic transition. We derive the magnetic phase diagrams likely to be observed in these materials, accounting for all possible magnetic interactions, and prove that skyrmion stability in the lacunar spinels is a general consequence of their crystal symmetry rather than the details of the material chemistry. Our results are consistent with all experimental reports in this space and demonstrate that the differences in the phase diagrams of particular spinel chemistries are determined by magnetocrystalline anisotropy, up to a normalization factor. We conclude that skyrmion formation over wide ranges of temperatures can be expected in all lacunar spinels, as well as in a wide range of uniaxial systems with low magnetocrystalline anisotropy.