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The effect of heavy ions on the magnetic properties of Fe 3 O 4  nanoparticles with  d  = 20–30 nm was studied. The magnetic properties were studied by vibrational magnetometry. It has been established that Fe 3 O 4  nanoparticles have ferromagnetic properties under normal conditions and at room temperature. The value of the specific magnetic moment was determined:  M  = 33.4 emu/g. It has been established that under the influence of temperature, a decrease in the value of the specific magnetic moment in Fe 3 O 4  nanoparticles is observed, at a temperature of  T C= 655 K, a ferromagnet-paramergrite phase transition occurs, and the value  M  = 0 is obtained. As a result of the study, the values of the specific magnetic moment and Curie temperature in Fe 3 O 4  nanoparticles irradiated with a stream of fast heavy  132 Xe ions with an energy of 167 MeV at intensities of 4.14 × 10 12  ion/cm 2 , 2.75 × 10 13  ion/cm 2  and 3.83 × 10 14  ion/cm 2 . The mechanism of change of magnetic properties depending on radiation is determined.

Influence of Heavy Ions on the Magnetic Properties of Fe 3 O 4 Nanoparticles