Micromagnetic modeling and small-angle neutron scattering characterization of magnetic nanocomposites
Micromagnetic modeling and small-angle neutron scattering characterization of magnetic nanocomposites
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DOI：
10.1103/physrevb.85.024410
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发表时间：
2012-01-11
影响因子：
3.7
通讯作者：
Michels, Andreas
中科院分区：
文献类型：
--
作者：
Erokhin, Sergey;Berkov, Dmitry;Michels, Andreas
提出了一种新的磁性纳米复合材料的微磁模拟方法。该方法特别适用于软磁基质相中含有硬磁夹杂物的两相复合材料的模拟。所提出的技术允许我们避免不必要的“硬”夹杂物的离散化(这些夹杂物通常处于单域状态)，但允许对“软”相进行任意精细的离散化。将该方法应用于确定纳米铁基纳米复合材料的平衡磁化态，并计算了相应的小角中子散射截面。我们的模拟结果与实验观察到的非平凡的“三叶草”SANS截面有显著的一致性。
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 us to avoid unnecessary discretization of the "hard" inclusions (these are normally in a single-domain state) but enables 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. The results of our simulations exhibit a remarkable agreement with nontrivial "clover-leaf" SANS cross-sections observed experimentally.