Theory of magnetic small-angle neutron scattering of two-phase ferromagnets

Abstract

Based on micromagnetic theory we have derived analytical expressions for the magnetic small-angle neutron scattering (SANS) cross section of a two-phase particle-matrix-type ferromagnet. The approach---valid close to magnetic saturation---provides access to several features of the spin structure such as perturbing magnetic anisotropy and magnetostatic fields. Depending on the applied magnetic field and on the magnitude $H_p$ of the magnetic anisotropy field relative to the magnitude $\Delta M$ of the jump in the longitudinal magnetization at the particle-matrix interface, we observe a variety of angular anisotropies in the magnetic SANS cross section. In particular, the model explains the "clover-leaf"-shaped angular anisotropy which was previously observed for several nanostructured magnetic materials, and it provides access to the magnetic interaction parameters such as the average exchange-stiffness constant. It is also shown that the ratio $H_p/\Delta M$ decisively determines the asymptotic power-law exponent and the range of spin-misalignment correlations.

References in corpus (1)

• Magnetic neutron scattering on nanocomposites: decrypting cross-section images using micromagnetic simulations

Cited by in corpus (19)

• Resolving complex spin textures in nanoparticles by magnetic neutron scattering
• Effect of Dzyaloshinski-Moriya interaction on spin-polarized neutron scattering
• Analysis of magnetic neutron-scattering data of two-phase ferromagnets
• Third-order effect in magnetic small-angle neutron scattering by a spatially inhomogeneous medium
• Magnetic neutron scattering by magnetic vortices in thin submicron-sized soft ferromagnetic cylinders
• The magnetic structure factor of correlated moments in small-angle neutron scattering
• Revealing defect-induced spin disorder in nanocrystalline Ni
• Micromagnetic simulation of neutron scattering from spherical nanoparticles: Effect of pore-type defects
• Magnetic neutron scattering from spherical nanoparticles with Neel surface anisotropy: Atomistic simulations
• Small-angle neutron scattering by spatially inhomogeneous ferromagnets with a nonzero average uniaxial anisotropy
• Unraveling the magnetic softness in Fe-Ni-B based nanocrystalline material by magnetic small-angle neutron scattering
• Magnetic neutron scattering from spherical nanoparticles with Neel surface anisotropy: Analytical treatment
• Unraveling Nanostructured Spin Textures in Bulk Magnets
• Experimental observation of third-order effect in magnetic small-angle neutron scattering
• Magnetic Guinier law
• Uniaxial polarization analysis of bulk ferromagnets: Theory and first experimental Results
• Magnetic correlations in polycrystalline $\mathrm{T}{\mathrm{b}}_{0.15}\mathrm{C}{\mathrm{o}}_{0.85}$
• Single-$q$ Cycloid and Double-$q$ Vortex Lattices in Layered Magnetic Semimetal EuAg${}_4$Sb${}_2$
• Scaling in Magnetic Neutron Scattering