Перегляд за Автор "Kulish, V. V."

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    Theory of Dipole--Exchange Spin Waves in a Ferromagnetic Nanotube in the Presence of a Thermoelectrically Induced Spin-Transfer Torque
    (КПІ ім. Ігоря Сікорського, 2026) Kulish, V. V.; Yeromin, S. I.
    A theoretical study of dipole–exchange spin waves in a conducting ferromagnetic nanotube subjected to a longitudinal temperature gradient is presented. The temperature gradient generates an electric current via the Seebeck effect, which becomes spin-polarized in the ferromagnet and produces a spin-transfer torque acting on the magnetization. The magnetization dynamics is described within the Landau–Lifshitz–Gilbert equation augmented by the Zhang–Li torque terms corresponding to adiabatic and nonadiabatic spin transport. An analytical dispersion relation for spin waves in a thin-walled nanotube with uniaxial anisotropy is derived. It is shown that the thermoelectrically induced spin-polarized current causes a Doppler-like shift of the spin-wave spectrum and modifies the effective damping. A critical temperature gradient at which spin-wave generation starts is obtained.
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    Wave Coupling and Dispersion of Magnon-Plasmon Polaritons in Layered AFM-Based Systems
    (КПІ ім. Ігоря Сікорського, 2025) Gorobets, O. Yu.; Kulish, V. V.; Yeromin, S. I.
    The report presents a theoretical analysis of surface magnon-plasmon polaritons (MPPs) in a layered structure with a thin uniaxial antiferromagnetic (AFM) film between two non-magnetic metals. The interaction between electromagnetic modes and AFM magnetization dynamics, influenced by a non-diagonal magnetic permeability tensor, leads to hybridized wave states. Unlike in ferrite-based systems, E- and H-waves in AFM media cannot be treated independently. The resulting biquadratic dispersion relation yields two frequency branches with anisotropy-driven shifts. An exact fourth-order equation reveals four solution branches and four corresponding modes, with two displaying significant damping and two supporting low-loss wave propagation.