Dependence of the dynamical behaviour of ferrofluid (FF) subsystems, i.e. nuclear and magnetic contributions to the scattering cross section, on the external magnetic field has been observed. In zero field, the nuclear subsystem of FF has a soft mode with the relation ω∼q4, which can be explained by means of a dipole-bond fractal. This fractal gets broken by applying a magnetic field and then the motion of particles approaches ordinary diffusion, i.e ω∼q2. The magnetic subsystem is superparamagnetic in a low field and it reveals the fast relaxation of spin components transversal to magnetization in a high field.
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics