Nonlinear Behavior of Magnetic Fluid in Brownian Relaxation: Numerical Simulation and Derivation of Empirical Model
Nonlinear Brownian relaxation of magnetic fluids for the case of large excitation field was studied in relation to its biomedical applications. The Fokker-Planck equation, which describes the nonlinear behavior of magnetic fluids, was solved by numerical simulation when ac field was applied. Frequency-dependences of the harmonics were investigated in terms of the effective Brownian relaxation time τ eff, which was empirically obtained from the ac susceptibility of the fundamental component. It was shown that higher harmonics become small even at ωτ eff=1 compared to each quasi-static harmonics amplitudes.
KeywordsFrequency Dependence Nonlinear Behavior Magnetic Fluid High Harmonic Nonlinear Property
Unable to display preview. Download preview PDF.