Figure 15.
Top: Colloidal magnetic particles subjected to a beam with wave vector k0 in the absence of an external magnetic field. Magnetic moments of the particles have arbitrary directions, and the scattering pattern is isotropic. Bottom: Model representation for the nuclear and magnetic particle structures in a magnetic fluid. R0 is the physical size of the core, and R1 is the radius of the shell/coating. The parameters ρ0, ρ1, and ρs are the nuclear scattering length densities of the core, shell, and solvent, respectively. ρm is the scattering length density for the magnetic part, having a radius Rm. (Reprinted with permission from [229]. Copyright Uspekhi Fizicheskikh Nauk 2010).