磁性纳米复合材料：微磁学建模和SANS实验的新方法
Magnetic nanocomposites: new methodology for micromagnetic modeling and SANS experiments
摘要：
提出了一种新的磁性纳米复合材料的微磁学模拟方法。该方法是特别适合于模拟的两相复合材料组成的硬磁夹杂物在软磁基体相。所提出的技术允许避免不必要的离散化的“硬”夹杂物（这些通常是在一个单域状态），但使一个任意的“软”相的精细离散化。该方法被施加到铁基纳米复合材料从Nanoperm（FeZrBCu）家族的合金的平衡磁化状态的测定和相应的小角中子散射（SANS）截面的计算。对于这种非常有趣的材料，我们的模拟结果与实验观察到的非平凡的“三叶草”SANS横截面非常一致（A。Michels等人，B，v. 74，134407（2006））。
英文摘要：
A new methodology for micromagnetic simulations of magnetic nanocomposites is presented. The methodology is especially suitable for simulations of two-phase composites consisting of magnetically hard inclusions in a soft magnetic matrix phase. The proposed technique allows to avoid the unnecessary discretization of the 'hard' inclusions (these are normally in a single-domain state), but enables an arbitrary fine discretization of the 'soft' phase. The method is applied to the determination of the equilibrium magnetization state of an iron-based nanocomposite from the Nanoperm (FeZrBCu) family of alloys and to the calculation of the corresponding small-angle neutron scattering (SANS) cross-section. For this highly interesting material, the results of our simulations exhibit a remarkable agreement with the nontrivial 'clover-leaf' SANS cross-sections observed experimentally (A. Michels et al., Phys. Rev. B, v. 74, 134407 (2006)).
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