FeGe纳米球的三维手性磁化结构
Three-Dimensional Chiral Magnetization Structures in FeGe Nanospheres
摘要：
Skyrmions，自旋螺旋，和其他手性磁化结构中的材料与固有的Dzyaloshinsky-Moriya相互作用显示独特的性能，一直在薄膜几何形状的激烈研究的主题。在这里，我们研究的形成三维手征性磁化结构的FeGe纳米球通过微磁有限元模拟。尽管颗粒的尺寸是深亚微米，我们发现了令人惊讶的大量的不同的平衡态，即螺旋，meron，skyrmion，手性bobber和准饱和态。这些状态的分布总结在一个相图显示的基态作为外部场和粒子半径的函数。单个纳米颗粒中这种不寻常的可能磁化状态的多样性可能是多态存储器件的有用特征。我们还表明，磁偶极相互作用在这些系统中几乎可以忽略不计，这表明粒子可以在高密度排列，而不会经历不必要的耦合。
英文摘要：
Skyrmions, spin spirals, and other chiral magnetization structures developing in materials with intrinsic Dzyaloshinsky-Moriya Interaction display unique properties that have been the subject of intense research in thin-film geometries. Here we study the formation of three-dimensional chiral magnetization structures in FeGe nanospheres by means of micromagnetic finite-element simulations. In spite of the deep sub-micron particle size, we find a surprisingly large number of distinct equilibrium states, namely, helical, meron, skyrmion, chiral-bobber and quasi-saturation state. The distribution of these states is summarized in a phase diagram displaying the ground state as a function of the external field and particle radius. This unusual multiplicity of possible magnetization states in individual nanoparticles could be a useful feature for multi-state memory devices. We also show that the magneto-dipolar interaction is almost negligible in these systems, which suggests that the particles could be arranged at high density without experiencing unwanted coupling.
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