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arXiv 1702.01212cond-mat.mes-hall
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交换各向异性诱导的Helimagnets中Skyrmion晶格的方向依赖稳定性

Direction-Dependent Stability of skyrmion lattice in helimagnets induced by Exchange Anisotropy

Yangfan Hu

摘要:

交换各向异性为非中心对称大块手征磁体中Skyrmion晶格相的稳定性提供了方向依赖机制。基于Skyrmion晶格的傅立叶表示,我们解释了方向依赖的温度-磁场相图的块状MnSi通过一个唯象的平均场模型,包括交换各向异性。通过与实验结果的定量比较,我们澄清了体MnSi中skyrmion晶格相的稳定性是由负交换各向异性和热涨落的综合作用决定的。详细讨论了交换各向异性和傅里叶表示阶数对Skyrmion晶格平衡性质的影响。

英文摘要:

Exchange anisotropy provides a direction dependent mechanism for the stability of the skyrmion lattice phase in noncentrosymmetric bulk chiral magnets. Based on the Fourier representation of the skyrmion lattice, we explain the direction dependence of the temperature-magnetic field phase diagram for bulk MnSi through a phenomenological mean-field model incorporating exchange anisotropy. Through quantitative comparison with experimental results, we clarify that the stability of the skyrmion lattice phase in bulk MnSi is determined by a combined effect of negative exchange anisotropy and thermal fluctuation. The effect of exchange anisotropy and the order of Fourier representation on the equilibrium properties of the skyrmion lattice is discussed in detail.

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