Microwave absorption by magnetic nanoparticles in the organism

An estimate is presented for the rate of microwave absorption by magnetic nanoparticles in the organism. The absorption takes place because of energy dissipation at ferromagnetic resonance. Based on the known solution of the Landau-Lifshits equation, the imaginary part of complex susceptibility is evaluated, which gives the absorption rate. It is shown that even under thermal isolation of the particles, their heating would be insignificant upon absorption of radiation with an energy flux density on the order of 1 mW/cm², and such a mechanism is unrelated to the observable effects of low-intensity microwaves.