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

Volume

38

Issue

5

fYear

2002

fDate

9/1/2002 12:00:00 AM

Firstpage

3228

Lastpage

3230

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;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2002.802497

Filename

1042506