Registration Number
0222U001521,
0119U100772
, R & D reports
Title
Directed transport and energy dissipation in systems of ferromagnetic nanoparticles and magnetic skimmions
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Head
Denisov Stanislav I., Доктор фізико-математичних наук
Registration Date
28-01-2022
Organization
Sumy State University
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Objects of research: conditions for the existence of directed transport of ferromagnetic nanoparticles and the dependence of their drift speed and power loss on the Reynolds numbers, external magnetic field characteristics, degree of spin current polarization, dipole interaction, magnetic anisotropy field, film defect structure, temperature, and other parameters.
The subject of research is the directed transport (drift) of ferromagnetic nanoparticles and magnetic skyrmions, which is caused by the reaction of the medium, and energy processes in them.
The aim of the research is to develop the theory of directed transport of ferromagnetic nanoparticles in a viscous liquid and magnetic skyrmions in ferromagnetic films, as well as to determine the power loss in these systems.
Research methods: methods of micromagnetism, mathematical physics, numerical methods.
The deterministic dynamics of single-domain ferromagnetic nanoparticles in dilute ferrofluids under the influence of a stationary or time-periodic gradient magnetic field is studied theoretically. The precession modes of compatible magnetic and mechanical dynamics are classified and the influence of the modes on the absorption power is established. A theory of the dynamics of noninteracting particles with finite anisotropy is constructed. The power loss is determined as a function of the system parameters. In the approximation when the magnetic moments of the nanoparticles are "frozen" in them, a deterministic theory of the drift of such particles is built. It is shown that since the gradient magnetic field generates both translational and rotational motions of the particles, these motions are interconnected. It is established that, depending on the initial position of the suspended ferromagnetic nanoparticles, there are four modes of their directed transport in a stationary gradient magnetic field.
The results of the Project can be used in biomedicine and nanoparticle separation processes
Product Description
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Bistryk Yurii S.
Denisov Stanislav I.
Denisova Elena S.
Lyutyy Taras V.
Pedchenko Bogdan O.
Reva Vladyslav V.
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2022-03-09
