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)).
@article{arxiv.1109.4075,
title = {Magnetic nanocomposites: new methodology for micromagnetic modeling and SANS experiments},
author = {Sergey Erokhin and Dmitry Berkov and Nataliya Gorn and Andreas Michels},
journal= {arXiv preprint arXiv:1109.4075},
year = {2011}
}
Comments
18 pages, 7 figures; Submitted to Physical Review B