A THEORETICAL CONSIDERATION OF THE DIELECTRIC BEHAVIORS OF FERROFLUIDSUBJECTED TO A MAGNETIC-FIELD

The,dielectric behaviors of a ferrofluid subjected to a magnetic field are discussed theoretically on the basis of the model of dynamically chain-growing process with increase of the magnetic field. The model, which is an expansion of the former model of stationarily chain-growin g process, is put forward by defining the anisotropy of the ferrofluid as a function of the magnetic field. Thus, the dielectric constant ma trix of a ferrofluid subjected to a magnetic field can be established. Some theoretical calculations about the field dependencies of both th e refractive indices and the transmission coefficients in the two dire ctions, parallel and perpendicular to the field direction, are carried out for different particle concentrations of the ferrofluid and concl usions are drawn. (C) 1995 American Institute of Physics.