Low Temperature Physics: 47, 220 (2021); https://doi.org/10.1063/10.0003522
Analysis of low-temperature FMR spectra of Fe3O4 and ZnFe2O4 nanoparticles synthesized using organic molecules
K. Yu. Sova, A. S. Vakula, and S. I. Tarapov
O. Ya. Usikov Institute for Radiophysics and Electronics of the National Academy of Sciences of Ukraine Kharkov 61085, Ukraine
A. G. Belous and S. O. Solopan
Institute of General and Inorganic Chemistry of the National Academy of Sciences of Ukraine Kiev 03142, Ukraine
Received November 11, 2020, published online January 26, 2021
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 post-synthesis 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.
Key words: nanoparticles, nanopowders, ferromagnetic resonance, microwave frequencies, low temperatures, organic molecules.