MnNiGa块体晶体中取向的三维磁性双克尔米子
Oriented Three-Dimensional Magnetic Biskyrmion in MnNiGa Bulk Crystals
摘要：
一个biskyrmion由两个束缚的，拓扑稳定的skyrmion自旋纹理。这些咖啡豆形状的物体已经在真实空间中使用洛伦兹透射电子显微镜（LTEM）在薄板中观察到。仅从LTEM成像来看，尚不清楚biskyrmions是否是表面限制的物体，或者类似于非中心对称helimagnets中的skyrmions，在大块样品中的三维管状结构。在这里，我们调查的biskyrmion形状因子的单晶和多晶MnNiGa样品使用小角中子散射（SANS）。我们发现，biskyrmions不是长程有序的，甚至在单晶中也不是。令人惊讶的是，所有的无序双克尔米子都有它们的面内对称轴沿某些方向排列，由磁晶各向异性控制。这种各向异性的性质可以进一步利用biskyrmions编码信息。
英文摘要：
A biskyrmion consists of two bound, topologically stable skyrmion spin textures. These coffee-bean-shaped objects have been observed in real-space in thin plates using Lorentz transmission electron microscopy (LTEM). From LTEM imaging alone, it is not clear whether biskyrmions are surface-confined objects, or, analogously to skyrmions in non-centrosymmetric helimagnets, three-dimensional tube-like structures in bulk sample. Here, we investigate the biskyrmion form factor in single- and polycrystalline MnNiGa samples using small angle neutron scattering (SANS). We find that biskyrmions are not long-range ordered, not even in single-crystals. Surprisingly all of the disordered biskyrmions have their in-plane symmetry axis aligned along certain directions, governed by the magnetocrystalline anisotropy. This anisotropic nature of biskyrmions may be further exploited to encode information.
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