Dipolar spin-misalignment correlations in inhomogeneous magnets: comparison between neutron scattering and micromagnetic approaches

摘要

In inhomogeneous bulk ferromagnets, the dominating sources of spin disorderare related to spatial variations of (i) the magnitude of the local saturationmagnetization and of (ii) the magnitude and/or direction of the magneticanisotropy field. For the particular example of a porous ferromagnet, where themagnetization inhomogeneity is at maximum, we demonstrate, by means ofexperimental neutron scattering data and micromagnetic simulations, theanisotropic character of magnetization fluctuations induced by the dipolarinteraction.