Magnetic and structural investigations on barium hexaferrite ferrofluids

Barium hexaferrite BaFe12� 2xTixCoxO19 ferrofluids have been prepared using oleic acid as surfactant and Isopar M s or dodecane as carrier liquid.The ferrite particles were prepared by glass crystallization.Hysteresis parameters, the initial susceptibility versus temperature and the magnetic particle size were obtained by VSM.Ferrofluids with a partly deuterated carrier liquid were investigated by small angle neutron scattering (SANS).SANS curves lead to a bimodal size distribution consisting of single magnetic particles with an organic shell and aggregated particles with an incomplete organic layer. r 2002 Elsevier Science B.V. All rights reserved.