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Current issue   Ukr. J. Phys. 2014, Vol. 59, N 5, p.541-546

    Paper

Gorobets Yu.I.1, Kulish V.V.2

1 Institute of Magnetism, Nat. Acad. of Sci. of Ukraine
(36-b, Vernads’kogo Str., Kyiv 03142, Ukraine)
2 Department of General and Experimental Physics,
National Technical University of Ukraine “Kyiv Politechnic Institute”
(37, Peremogy Prosp., Kyiv 03056, Ukraine)

Dipole-Exchange Spin Waves in a Ferromagnetic Nanotube

Section: Nanosystems
Original Author's Text: English

Abstract: Spin waves in a cylindrical ferromagnetic nanotube are studied. A nanotube with an external magnetic field applied parallel to its symmetry axis is considered. A linearized Landau–Lifshitz equation in the magnetostatic approximation is used with regard for the magnetic dipoledipole interaction, exchange interaction, and anisotropy effects. As a result, the dispersion relation and the radial wavenumber spectrum for spin waves in the above-described nanotube are found. From the radial wavenumber spectrum, limitations on the transverse-angular modes are defined.

Key words: spin wave, nanomagnetics, ferromagnetic nanotube, dipole-exchange theory.