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

TL;DR

This paper compares neutron scattering experiments and micromagnetic simulations to analyze dipolar spin-misalignment correlations in inhomogeneous ferromagnets, highlighting the anisotropic nature of magnetization fluctuations caused by dipolar interactions.

Contribution

It introduces a combined experimental and simulation approach to study spin disorder in porous ferromagnets, emphasizing the anisotropic effects of dipolar interactions.

Findings

Neutron scattering data reveals anisotropic magnetization fluctuations.

Micromagnetic simulations confirm the dipolar interaction's role in inhomogeneous magnets.

Porous ferromagnets exhibit maximum inhomogeneity in magnetization.

Abstract

In inhomogeneous bulk ferromagnets, the dominating sources of spin disorder are related to spatial variations of (i) the magnitude of the local saturation magnetization and of (ii) the magnitude and/or direction of the magnetic anisotropy field. For the particular example of a porous ferromagnet, where the magnetization inhomogeneity is at maximum, we demonstrate, by means of experimental neutron scattering data and micromagnetic simulations, the anisotropic character of magnetization fluctuations induced by the dipolar interaction.