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A new methodology for micromagnetic simulations of magnetic nanocomposites ispresented. The methodology is especially suitable for simulations of two-phasecomposites consisting of magnetically hard inclusions in a soft magnetic matrixphase. The proposed technique allows to avoid the unnecessary discretization ofthe 'hard' inclusions (these are normally in a single-domain state), butenables an arbitrary fine discretization of the 'soft' phase. The method isapplied to the determination of the equilibrium magnetization state of aniron-based nanocomposite from the Nanoperm (FeZrBCu) family of alloys and tothe calculation of the corresponding small-angle neutron scattering (SANS)cross-section. For this highly interesting material, the results of oursimulations 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)).

Magnetic nanocomposites: new methodology for micromagnetic modeling and SANS experiments