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Analysis of low-temperature FMR spectra of Fe3O4 and ZnFe2O4 nanoparticles synthesized using organic molecules

The ferromagnetic resonance (FMR) spectra of Fe3O4 and ZnFe2O4 nanoparticles with organic synthesis products were studied at T = 4.2 K. It was determined that the sintering of nanoparticles induced by postsynthesis heat treatment forms a mechanically unstable transition layer between them. Changes in the FMR spectra of Fe3O4 nanoparticles synthesized by precipitation in microemulsions using octylphenol ethoxylate and by the cryochemical method are mainly determined by the field of dipole-dipole interaction between nanoparticles.