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Registration Number

0222U001153, 0121U114633 , R & D reports

Title

Collective dynamics of ferromagnetic nanoparticles with a finite anisotropy in a viscous liquid

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Head

Liutyi Taras V., д.філос.н.

Registration Date

24-01-2022

Organization

Sumy State University

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 Objects of research: 1) precession regimes of the coupled magnetic and mechanical dynamics of ferromagnetic nanoparticles in a viscous liquid; 2) directed transport (drift) of the nanoparticles in gradient magnetic fields. The subject of research is the conditions for the existence of directed transport of these nanoparticles and the dependence of their drift speed and power loss on the system parameters. The aim of the study is to determine the optimal response parameters of periodically excited systems of ferromagnetic nanoparticles. Research methods: methods of micromagnetism, methods of mathematical physics, numerical methods. The project is aimed at an in-depth study of the forced dynamics of ferromagnetic single-domain nanoparticles with finite uniaxial anisotropy suspended in a viscous fluid and excited by an external rotating magnetic field. Based on the developed analytical and numerical tools, we analyze the generation of different precession regimes and their impact on energy absorption. It is shown that changes in dynamic modes lead to abrupt changes in power loss. The phenomenon of dissipation-induced rotation of a magnetically isotropic nanoparticle in a rotating field is described for the first time. It is also established that a gradient magnetic field, which varies in time according to the harmonic law, can initiate an unexpected effect - the appearance of directed transport of the nanoparticle. The conditions for the existence of this effect are formulated and the time dependence of the average velocity of the nanoparticle is determined. It is shown that the cause of the appearance of transport is the component of the external uniform magnetic field perpendicular to the gradient field. The results of Project can be used to select the optimal parameters in the method of magnetic hyperthermia for cancer treatment, targeted drug delivery in the body, and obtaining composite coatings that effectively absorb radio waves

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Denisov Stanislav I.
Denisova Elena S.
Lyutyy Taras V.
Moskalenko Maxym M.
Pavlyuk Maksym O.
Petrenko Nikita S.
Reva Vladyslav V.
Skyrya Yuriy O.

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2022-03-09