论文标题
纳米颗粒的随机磁中子散射横截面的角各向异性
On the angular anisotropy of the randomly-averaged magnetic neutron scattering cross section of nanoparticles
论文作者
论文摘要
我们使用landau-lifshitz方程计算了均匀磁化和随机定向的stoner-wohlfarth颗粒的稀释集合的磁性sans横截面。我们研究的重点是在二维位置敏感探测器上可以看出磁性SANS信号的角各向异性。根据颗粒的磁各向异性的对称性（例如单轴，立方），即使是在脱氧状态或强制场上，也可能会导致各向异性磁性SANS模式。讨论了不均匀磁化颗粒的情况以及粒度分布和颗粒间相关性的影响。
We calculate the magnetic SANS cross section of dilute ensembles of uniformly magnetized and randomly-oriented Stoner-Wohlfarth particles using the Landau-Lifshitz equation. The focus of our study is on the angular anisotropy of the magnetic SANS signal as it can be seen on a two-dimensional position-sensitive detector. Depending on the symmetry of the magnetic anisotropy of the particles (e.g. uniaxial, cubic), an anisotropic magnetic SANS pattern may result, even in the demagnetized state or at the coercive field. The case of inhomogeneously magnetized particles and the effects of a particle-size distribution and interparticle correlations are discussed.
