Homogeneous and heterogeneous nucleation of skyrmions in thin layers of cubic helimagnets
Homogeneous and heterogeneous nucleation of skyrmions in thin layers of cubic helimagnets
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DOI：
10.1103/physrevb.98.054404
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发表时间：
2018-08-06
影响因子：
3.7
通讯作者：
Inoue, K.
中科院分区：
文献类型：
--
作者：
Leonov, A. O.;Inoue, K.
本文研究了在立方螺旋磁层中，分别通过托龙和手征泡的伸长，通过均匀成核和非均匀成核形成孤立的手征skyrmions。torons和bobbers都是本地化的三维，包含奇点，并根据标准唯象模型内的理论分析，可以存在于非中心对称铁磁体的饱和和调制相位的亚稳态。它们的伸长率到无缺陷的skyrmion丝是促进小各向异性的贡献，使skyrmion核心相对于周围的父母状态负。我们发现，孤立的磁torons提出了同样的问题，与周围的相位的torons在约束挫折手征向列相兼容[I。I. Smalyukh等人，Nat.板牙. 9，139（2010）]。我们强调的磁性和液晶torons的不同特点，并计算相图表明其稳定区域。
Formation of isolated chiral skyrmions by homogeneous and heterogeneous nucleation has been studied in thin layers of cubic helimagnets via elongation of torons and chiral bobbers, respectively. Both torons and bobbers are localized in three dimensions, contain singularities, and, according to the theoretical analysis within the standard phenomenological models, can exist as metastable states in saturated and modulated phases of noncentrosymmetric ferromagnets. Their elongation into the defect-free skyrmion filament is facilitated by small anisotropic contributions making skyrmion cores negative with respect to the surrounding parental state. We show that isolated magnetic torons pose the same problem of compatibility with a surrounding phase as the torons in confinement-frustrated chiral nematics [I. I. Smalyukh et al., Nat. Mater. 9, 139 (2010)]. We underline the distinct features of magnetic and liquid-crystal torons and calculate phase diagrams indicating their stability regions.