Toward a Theory of the Kinetics of Remagnetization in Magnetic Composites

A theoretical study is performed of the kinetics of the remagnetization of an ensemble of interacting ferromagnetic particles immobilized in a host nonmagnetic medium. Results show that the effect interparticle interaction has on the kinetics of remagnetization is determined by the amplitude of the applied field, which slows the remagnetization of the composite in a weak field and accelerates it in a strong field. The interaction between particles raises both components of the composite’s complex magnetic susceptibility.