Abstract
The paper is devoted to theoretical studies of the magnetodipolar interparticle interaction effect on magnetization dynamics in moderately concentrated ferrofluids. We consider a homogeneous (without particle aggregates) ferrofluid consisting of identical spherical particles and employ a rigid dipole model, where the particle magnetic moment is fixed with respect to the particle itself. For the magnetization relaxation after an instant change of the external field, we show that the magnetodipolar interaction leads to the increase of the initial magnetization relaxation time. For the complex ac-susceptibility χ we find that the this interaction leads to an overall increase of its imaginary part χ" and shifts the χ" – peak towards lower frequencies. Comparing results obtained with our analytical approach to numerical simulation data, we demonstrate that the theory provides good quantitative agreement with numerical simulations up to the particle volume fraction ϕ ∼ 6 – 10%
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