Ferromagnetic Resonance Features in Biological Objects Agaricus bisporus

The ferromagnetic resonance (FMR) of magnetite nanoparticles was studied at T=293 K and T=4.2 K. Nanoparticles were introduced into Agaricus bisporus at concentrations of 1.0 mg/ml and 0.1 mg/ml. From experimental studies of the FMR, the values of effective magnetization and spectral line widths were obtained. An electron paramagnetic resonance (EPR) response was detected in Agaricus bisporus after its high-gradient magnetic separation and without introduction of magnetite nanoparticles, which indicates the presence of natural magnetism in it.