Sova K. Electromagnetic properties of magnetic nanoparticles under thermal deformations

Українська версія

Thesis for the degree of Doctor of Philosophy (PhD)

State registration number

0823U100799

Thesis Registration Form

0823U100799.pdf

Applicant for

Specialization

  • 104 - Фізика та астрономія

07-11-2023

Specialized Academic Board

ДФ ID2290

O. Ya. Usikov Institute for Radiophysics and Electronics NAS of Ukraine

Essay

The purpose of the work is to establish the nature of the dependence of ferromagnetic resonance spectra in the centimeter and millimeter wavelength ranges on thermal deformations in conglomerates of magnetic nanoparticles, and to identify the mechanisms responsible for such dependence. The object of research is the interaction of electromagnetic waves in the centimeter and millimeter wavelength range with magnetic nanoparticles at room and low temperatures. Theoretical and practical results. The conducted research expands knowledge about the interaction of electromagnetic waves with magnetic nanoparticles and deepens the understanding of the fundamental interactions that occur between magnetic nanoparticles at room and low temperatures. Novelty of scientific results. For the first time, temperature-dependent competition between the field of external stresses and the field of dipole-dipole interaction between magnetic nanoparticles for the contribution to the total effective field of magnetic anisotropy was experimentally registered in sintered magnetic nanoparticles AFe2O4 by the method of electron spin resonance. Mechanical stresses in a conglomerate of magnetic La0.775Sr0.225MnO3 nanoparticles coated with silicon oxide were experimentally recorded using the electron spin resonance method. It was determined that mechanical stresses are the result of thermal deformations caused by the difference in the coefficients of expansion of the material of magnetic nanoparticles and the material of their shells. Research methods. The experimental study of magnetic nanoparticles was carried out using the methods of microwave radio spectroscopy and, in particular, the method of electron spin resonance in the centimeter and millimeter wavelength ranges. Degree of implementation. The results will contribute to the development of miniature high-frequency components of radio-electronic equipment in the microwave range. Scope of use. Quantum conversion of information and materials with the shape memory effect; development of hyperthermia techniques and targeted delivery of drugs to organs; development of radiation technologies and sensors based on perovskite nanomagnets.

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Research papers

Sova K.Yu., Vakula A.S., Tarapov S.I., Belous A.G., Solopan S.O., Analysis of low-temperature FMR spectra of Fe3O4 and ZnFe2O4 nanoparticles synthesized using organic molecules, Low Temperature Physics, 2021, Vol. 47, P. 241-247.

Sova K.Yu., Vakula A.S., Кalmykova Т.V., Tarapov S.I., Petrushenko S.I., Belous A.G., Solopan S.O., Low-temperature ferromagnetic resonance in bare and SiO2 coated La0.775Sr0.225MnO3 nanoparticles, Low Temperature Physics, 2022, Vol. 48, P. 372-377.

Vakula A.S., Polevoy S.Yu., Sova K.Yu., Nedukh S.V., Girich A.A., Tarapov S.I., Special features of low-temperature microwave ferromagnetic resonance in nanometer ferrite layer patterned by macroporous silicon substrate, Low Temperature Physics, 2023, Vol. 49, P. 467.

Girich A., Nedukh S., Polevoy S., Sova K., Tarapov S., Vakula A., Enhancement of the microwave photon-magnon coupling strength for a planar fabricated resonator, Scientific Reports, 2023, Vol. 13, P. 924.

Sova K.Yu., Vakula A.S., Polevoy S.Yu., Tarapov S.I., Laboratory magnetometer for express measurements of magnetic hysteresis loops, Radio physics and electronics, 2021, Vol. 26, No. 2, P. 32-36.

Sova K.Yu., Vakula A.S., Cherniakov E.I., Tarapov S.I., A string magnetometer using the method of small perturbations, Radio physics and radio astronomy, 2022, Vol. 27, No. 1, P. 48-52.

Kalmykova T., Vakula A., Sova K., Tarapov S., Gorobets S., Gorobets O., Evzhik L., Ferromagnetic Resonance Features in Biological Objects Agaricus bisporus, 2020 IEEE Ukrainian Microwave Week, September 21-25, 2020, Kharkiv, Ukraine, P. 859-861.

Sova K., Vakula A., Polevoy S., Girich A., Nedukh S., Tarapov S., Planar waveguide defect for photon-magnon coupling improvement, 2022 IEEE Ukrainian Microwave Week, 14-18 November 2022, Kharkiv, Ukraine, P. 118-122.

Sova K., Kravchuk O., Vakula A., Veverka P., Kaman O., Ferromagnetic resonance in silica-coated nanoparticles La0.80Sr0.20MnO3, International Advanced Study Conference «Condensed Matter and Low Temperature Physics 2020», June 8-14, 2020, Kharkiv, Ukraine, 2020, P. 58.

Sova K.Yu., Vakula A.S., Tarapov S.I., Belous A.G., Solopan S.O., Ferromagnetic resonance in nanoparticles CoFe2O4 at T=4.2 К, Conference dedicated to the 75th anniversary of G. V. Kurdyumov Institute for Metal Physics of NASU «Modern problems of physics of metals and metal systems», May 25-27, 2021, Kyiv, Ukraine, 2021, P. 87.

Sova K., Vakula A., Kalmykova T., Bereznyak E., Belous A., Tarapov S., Ferromagnetic resonance in Fe3O4 nanoparticles in combination with ligands, The Joint European Magnetic Symposia (JEMS 2022), July 24-29, 2022, Warsaw, Poland.

Sova K.Yu., Vakula A.S., Polevoy S.Yu., Tarapov S.I., Belous A.G., Solopan S.O., Determination of constitutive parameters of Fe3O4 nanoparticles in water solution with stabilizer, Telecommunications and Radio Engineering, 2020, Vol. 79, Iss. 18, P. 1663-1671.

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Files

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