烧结Nd-Fe-B磁体中的不等轴介观核织构与磁织构
Anisometric mesoscale nuclear and magnetic texture in sintered Nd-Fe-B magnets
AI总结：
本研究通过小角中子散射实验发现烧结织构化Nd-Fe-B磁体存在不等轴介观结构，结合模型估算其形状尺寸，证实核结构与磁散射各向异性相似并给出磁关联长度下界。
摘要：
通过对烧结各向同性与织构化Nd-Fe-B磁体开展依赖温度与波长的小角中子散射（SANS）实验，我们提供了织构化磁体微观结构中存在不等轴结构的证据。该结论是通过在远高于居里温度的条件下，观测总非极化SANS截面中特征性的十字形角各向异性得出的。将实验SANS数据与基于超二次曲面形状因子的微观结构模型进行对比，我们得以估算该结构的形状及尺寸下界。从室温下测得的数据中减去顺磁区的散射截面，即可得到磁SANS截面。令人意外的是，磁散射的各向异性与核SANS信号高度相似，表明核结构通过自旋-轨道耦合被磁矩修饰。基于二维关联函数的计算，我们估算了纵向与横向磁关联长度的下界。
英文摘要：
By means of temperature and wavelength-dependent small-angle neutron scattering (SANS) experiments on sintered isotropic and textured Nd-Fe-B magnets we provide evidence for the existence of an anisometric structure in the microstructure of the textured magnets. This conclusion is reached by observing a characteristic cross-shaped angular anisotropy in the total unpolarized SANS cross section at temperatures well above the Curie temperature. Comparison of the experimental SANS data to a microstructural model based on the superquadrics form factor allows us to estimate the shape and lower bounds for the size of the structure. Subtraction of the scattering cross section in the paramagnetic regime from data taken at room temperature provides the magnetic SANS cross section. Surprisingly, the anisotropy of the magnetic scattering is very similar to the nuclear SANS signal, suggesting that the nuclear structure is decorated by the magnetic moments via spin-orbit coupling. Based on the computation of the two-dimensional correlation function we estimate lower bounds for the longitudinal and transversal magnetic correlation lengths.
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