- Research Article
8- 10.1016/s0304-8853(00)00830-1
Magnetic aging in magnetic fluids: a static magnetic birefringence investigation
- May 01, 2001
- Journal of Magnetism and Magnetic Materials
- K Skeff Neto + 3 more +3
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- Research Article
- 40
- 10.1063/1.1345867
The influence of aggregates and relative permeability on the magnetic birefringence in ionic magnetic fluids
- Mar 15, 2001
- Journal of Applied Physics
- K Skeff Neto + 6 more +6
The static magnetic birefringence (SMB) of nickel-ferrite ionic magnetic fluid was investigated within the oscillating dipole-interaction anisotropy concept proposed by Xu and Ridler [J. Appl. Phys. 82, 326 (1997)]. The model was extended to include the magnetic texture of particle agglomerates and the field dependence of the magnetic permeability. The SMB data of samples subjected or not to a magnetic aging process and presenting particle concentration in the range of 2×1016 to 8×1016 particle/cm3 were successfully described. The particle size distribution obtained from the fit of the SMB data was discussed in comparison with the data obtained from transmission electron microscopy.
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