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Registration Number

0225U000809, (0122U001845) , R & D reports

Title

Kinetic, thermodynamic and magnetodynamic effects in multiparticle, quantum and mesoscopic systems

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Аналіз спінової динаміки матеріалів поблизу переходу між феромагнітним і антиферомагнітним станами та розвиток теорії ефективних потенціалів проходження у просторі-часі збуджень через наноструктури .

Head

Ivanov Boris O., Доктор фізико-математичних наук
Los Viktor F., д.ф.-м.н.

Registration Date

19-01-2025

Organization

Institute of Magnetism NAS of Ukraine and MES of Ukraine

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The goal of the project is to develop mathematical methods for analysis of different nonlinear dynamics modes in antiferromagnetic and textured structures of spintronics and magnonics, deriving of completely closed evolution equations which describing the kinetics of a statistical operator for an arbitrary system of quantum particles, obtaining the solution of time wave equations and the Klein-Gordon equation, as well as a rigorous consideration of the tunneling process from a potential well.

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 A new approach taking into account the influence of initial correlations in a system consisting of an N–reservoir subsystem on the dynamics of an open quantum system is proposed, based on the traditional projection operator technique. A new nonlinear evolution equation, which is accurate in the linear-in-n approximation, has been obtained and analyzed. Using the macrospin model, the influence of spin inertia on the critical spin dynamics of ferromagnets is investigated. It has been shown that chirality as an internal degree of freedom of the mesoscopic domain wall of a ferro- and antiferromagnet inside a quasi-one-dimensional system can be controlled using a spin-polarized current. It is also demonstrated that for a recently discovered new class of magnetic materials — altermagnets — chirality switching can be performed by a conventional charge current. A comprehensive analytical and numerical study of the dynamics of spin waves in a ferromagnetic film in the Damon-Eschbach geometry in the presence of surface anisotropy has been carried out. The mechanisms of the magneto-elastic interaction between the eigenmodes of yttrium iron garnet microparticles have been established.

Product Description

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Bondarenko Artem Yu.
Verba Roman V.
Ihor V. Herasymchuk
Kyreiev Vadym Ye.
Kolezhuk Oleksii K.
Slobodianiuk Denys V.
Tartakivska Olena V.

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2025-01-19