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Using a developed co-precipitation method, we synthesized spherical Fe 3 O 4  nanoparticles with a wide nonlinear absorption band of visible radiation. Optical properties of the synthesized nanoparticles dispersed in an optically transparent copolymer of methyl methacrylate with styrene were studied by optical spectroscopy and z-scan techniques. We found that the electric polarizability of Fe 3 O 4  nanoparticles is altered by low-intensity visible radiation ( I  ≤ 0.2 kW/cm 2 ; λ = 442 and 561 nm) and reaches a value of 10 7  Å 3 . The change in polarizability is induced by the intraband phototransition of charge carriers. This optical effect may be employed to improve the drug uptake properties of Fe 3 O 4  nanoparticles.   PACS  33.15.Kr  78.67.Bf  42.70.Nq

Photo-induced electric polarizability of Fe3O4 nanoparticles in weak optical fields