Title :
Birefringence of magnetite-based magnetic fluids: the effect of the surface-coating layer
Author :
Morais, P.C. ; Neto, K.Skeff ; Bakuzis, A.F. ; da Silva, M.F. ; Buske, N.
Author_Institution :
Inst. de Fisica, Brasilia Univ., Brazil
fDate :
9/1/2002 12:00:00 AM
Abstract :
Water-based and hydrocarbon-based magnetic fluids (MFs) containing Fe3O4 nanoparticles are investigated using static magnetic birefringence measurements. A strong dependence of the birefringence signal upon the magnetic permeability is found. In addition to the field dependence of the magnetic permeability, inclusion of dimers in the description of the birefringence signal yields excellent agreement between parameters obtained from birefringence and high-resolution microscopy data.
Keywords :
birefringence; ferrites; magnetic fluids; magnetic particles; magnetic permeability; magneto-optical effects; nanostructured materials; Fe3O4; Fe3O4 nanoparticles; dimers; field dependence; high-resolution microscopy data; hydrocarbon-based magnetic fluids; magnetic permeability; magnetite-based magnetic fluids; static magnetic birefringence measurements; surface-coating layer; water-based magnetic fluids; Biomedical measurements; Birefringence; Hyperthermia; Iron; Magnetic force microscopy; Magnetic levitation; Magnetic liquids; Magnetic separation; Nanoparticles; Permeability;
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.2002.802497
