Dynamical properties of magneto-optical effect in magnetic fluid thin films

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Abstract
The dynamical properties of the magneto‐optical effects of magnetic fluids thin films were investigated. The thin films, 12 μm thick, of magnetite colloidal particles in water solvents and alkylnaphthalene one were prepared. A pulsed magnetic field H(t) was generated in a single turn coil by discharging a 40‐kV capacitor bank. The intensity I(t) of the transmitted light through the two crossed polarizers and the films located in the coil was measured. The relaxation process of the magneto‐optical effect can be described in terms of a single relaxation time, τ=3 μs, for a water‐based magnetic fluid, while the relaxation time constant for alkylnaphthalene one depends on the field strength. These dynamical properties can be interpreted by the time‐dependent Ginzburg–Landau theory by introducing the order parameter of the colloidal particles.

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