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Current issue   Ukr. J. Phys. 2014, Vol. 58, N 6, p.586-595


Kondovych S.V.1, Gomonay H.V.1, Loktev V.M.2

1 National Technical University of Ukraine “Kyiv Polytechnical Institute”
(37, Peremogy Ave., Kyiv 03056, Ukraine; e-mail: ksvitlana@i.ua)
2 Bogolyubov Institute for Theoretical Physics, Nat. Acad. of Sci. of Ukraine
(14b, Metrolohichna Str., Kyiv 03680, Ukraine)

Magnetic Dynamics of a Multiferroic with an Antiferromagnetic Layer

Section: Nanosystems
Original Author's Text: Ukrainian

Abstract: Shape effects in magnetic particles are widely studied, because of the ability of the shape and the size to control the parameters of a sample during its production. Experiments with nanosized samples show that the shape can affect also the properties of antiferromagnetic (AFM) materials. However, the theoretical interpretation of these effects is under discussion. A model to study the shape-induced effects in AFM particles at the AFM resonance frequency is proposed. The Lagrange function method is used to calculate the spectrum of resonance oscillations of the AFM vector in a synthetic multiferroic (piezoelectric + antiferromagnet). The influence of the specimen shape on the AFM resonance frequency in the presence of an external magnetic field is studied. Conditions for a resonance under the action of an external force or for a parametric resonance to arise in the magnetic subsystem are considered.

Key words: antiferromagnet, piezoelectric, multiferroic, nanoparticles, Lagrangian.