The coupling between angular (twisting) and longitudinal modulations arising near the ordering temperature of noncentrosymmetric ferromagnets strongly influences the structure of skyrmion states and their evolution in an applied magnetic field. In the precursor states of cubic helimagnets, a continuous transformation of skyrmion lattices into the saturated state is replaced by the first-order processes accompanied by the formation of multidomain states. Recently the effects imposed by dominant longitudinal modulations have been reported in bulk MnSi and FeGe. Similar phenomena can be observed in the precursor regions of cubic helimagnet epilayers and in easy-plane chiral ferromagnets (e.g. in the hexagonal helimagnet CrNb3S6).
Switching magnetic texture via in-plane magnetic field in noncentrosymmetric dipolar magnets: From skyrmions to antiskyrmions and nontopological magnetic bubbles
Helical Magnon Frequency Comb in Synthetic Antiferromagnetic Skyrmion Lattices
Shenzhen Technology University(深圳技术大学);Shenzhen Key Laboratory of Ultraintense Laser and Advanced Material Technology, Center for Intense Laser Application Technology, and College of Engineering Physics, Shenzhen Technology University(深圳技术大学工程物理学院);College of Applied Sciences, Shenzhen University(深圳大学应用科学学院);The Center for Advanced Quantum Studies and School of Physics and Astronomy, Beijing Normal University(北京师范大学物理与天文学院);Key Laboratory of Multiscale Spin Physics, Beijing Normal University(北京师范大学多尺度自旋物理重点实验室);School of Physics, Central South University(中南大学物理学院)
Homogeneous and heterogeneous nucleation of skyrmions in thin layers of cubic helimagnets
本文研究了在立方螺旋磁层中,分别通过托龙和手性bobbers的伸长,通过均匀成核和非均匀成核形成孤立的手性skyrmions。Torons和bobbers都是三维局域的,包含奇异性,并且根据标准唯象模型内的理论分析,可以作为亚稳态存在于非中心对称铁磁体的饱和和调制相位中。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。Smalyukh等人,Nature Mater 9,139-145(2010)]。我们强调的磁性和液晶torons的不同特点,并计算表明其稳定区域的相图。
Magnetoelectric Cavity Magnonics in Skyrmion Crystals
本文提出了非中心对称磁体腔中磁电磁振子-光子耦合的理论。类似于多铁性中的非互易现象,磁电耦合是时间反演和反转非对称的。这种不对称性为磁振子-光子耦合的特殊可调谐性提供了一种手段,这种耦合可以通过反转磁化方向来打开和关闭。以具有超低磁阻尼的多铁Skyrmion-host Cu $_2$ OSeO $_3$为例,揭示了Skyrmion本征模的电活动性,并提出将其用于“磁暗”椭圆模的磁振子-光子分裂.此外,我们预测了腔诱导的磁振子-磁振子耦合之间的磁电活性skyrmion激发。我们讨论了在量子信息处理中的应用,提出了全电磁振子介导的光子量子门和光子介导的磁振子SPLIT操作的协议。我们的研究突出了磁电腔磁振子作为一个新的平台,实现量子混合系统和拓扑磁纹理中的光子和磁振子之间的相干转导。