Mössbauer spectroscopy, proton relaxometry, and transmission electron microscopy are used to study magnetite nanoparticles designed for creating diagnostic contrast media. Superparamagnetic magnetite nanoparticles with a size of 5-7 nm and blocking temperature of T b = 50 K are examined as a component of diagnostic contrast media with relaxation times T 1 and T 2 capable of circulating in the bloodstream for a long time. Larger ferrimagnetic nanoparticles (30-40 nm) can be concentrated in pathological tissues by applying an external magnetic field, thereby providing a means for hyperthermia.

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An atomic force microscopy investigation into the deposition of nanoscale magnetite from drops of an aqueous suspension applied to the surface of a porous polymer film is conducted. Analysis of the micros copy images reveals the formation of agglomerates and a certain orientation of the deposited magnetite nano particles due to anisotropy of the structured space of the porous material and magnetic interaction of the nanoparticles with each other.

Currently, the wide use of satellite stations and equipment, household electronic apparatus, and mobile telephones is leading to an increase in the electromagnetic background; this means that the population is being exposed to twenty-four-hour electromagnetic radiation (EMR). Therefore, there is a serious need not only to study the effect of electromagnetic irradiation on the human body but also to develop possible methods of protection [1-3]. One measure is to manufacture small-thickness polymeric coatings and materials capable of absorbing EMR in a wide wavelength range.