6533b7d8fe1ef96bd126a1c8

RESEARCH PRODUCT

Effects of the magnetodipolar interactions in the alternating magnetic fields

subject

description

A macroscopic theory for the description of the structure formation in a system of magnetic dipoles under the action of a high-frequency rotating field is presented. Continuum equations for the effective magnetic field strength describing particle interactions are derived. It is shown that, contrary to the case of a constant magnetic field, where the demagnetizing field arising from a concentration fluctuation stabilizes the system with respect to the phase separation, the same concentration fluctuation will be amplified in the case of a rotating magnetic field, leading to the formation of a layered structure. The extensions of the model necessary for the description of the formation of the periodic structures in the rotating field are considered and the relevance of the present model for the explanation of phase separation in shear flows of magnetorheological suspensions is indicated.