Abstract
Three effective medium theories (Maxwell-Garnett Theory, MGT; Bruggeman Effective Medium Theory, BEMT; and Coherent Model Approximation, CMA) are applied to predict magnetic susceptibility of polymer-magnetic particle composites and composite resonant frequency. Predictions are compared to the measurement of multi-crystalline magnetic particulate-polymer composites. Particulates had aspect ratios near unity; bulk low frequency susceptibilities ranged from 27 to 1000 s and particle volume fractions were between 5% and 100%. Emphasis was placed on CMA and BEMT. BEMT was selected for incorporation of a scaling function relating demagnetization with particulate concentration. The scaled model is scaled effective medium theory (ScEMT). Percolation theory and micromagnetic computations were applied to guide the choice of scaling function parameters. Experimental support of scale model physics was taken from measurements of magnetic sphere clustering in two dimensions. Scaling function constants and power laws w...
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