Abstract
The polar Kerr rotation developed by thin films of granular material is calculated for spherical cobalt particles in an SiO 2 insulator matrix. Effective optical and magneto-optic parameters are calculated for different volume fractions q of particles with radii in the range 1.5–6.0 nm. Films of dispersed particles with radius 4.5 nm are shown to produce polar Kerr rotations approximately two times greater than those for continuous films of the same thickness. The potential of such films as a thermomagnetic recording medium for data storage is briefly discussed.
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