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M. M. Bataiev, Yu. M. Bataiev, O. M. Lavrynenko, O. A. Kornienko
«Surface Magnetic Properties and Magnetization Dynamics of Magnetite Nanoparticles Doped with Platinum Ions»
311–320 (2020)

PACS numbers: 75.70.Rf, 75.75.Jn, 76.30.He, 81.05.Rm, 81.07.Bc, 81.07.Wx, 81.20.Fw

Magnetization dynamics and surface magnetic properties of the magnetite nanoparticles doped with platinum cations are studied on the microscopic level using EPR spectroscopy. The composite samples are formed on the steel surface contacted with Pt-containing water solutions under the rotation–corrosion dispergation conditions. Increase in Pt part in the structure of nanocomposites is accompanied by the corresponding shift of the EPR lines towards higher energies. Absorption EPR spectroscopy demonstrates specific spectroscopic characteristics for Pt-containing samples under controlled conditions. Spectroscopic parameters for the Pt samples obtained by high-quality processing and analysis provide appropriate mathematical model for the EPR spectroscopy results. Procedure of interpolation and fit for the EPR experimental data gives opportunity to develop a theoretical model for a set of samples. From EPR absorption spectra analysis for Pt-bearing samples, it is concluded that the Lorentz theoretical model is the most applicable for Pt data. The correlation between the concentration of Pt ions and the location of the corresponding EPR line in the spectrum is observed. An increase in Pt concentration in the particle structure leads to a corresponding shift of the EPR line towards higher energies. The change in magnitude intensity of the obtained spectra is described within the scope of the theory of Knight shift in ferromagnetics.

Keywords: magnetite nanoparticles doped with Pt, EPR spectroscopy, magnetization dynamics, surface magnetic properties

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