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Current issue   Ukr. J. Phys. 2014, Vol. 58, N 6, p.596-603

    Paper

Pylypovskyi O.V.1, Sheka D.D.1, Kravchuk V.P.2, Gaididei Yu.B.2, Mertens F.G.3

1 Taras Shevchenko National University of Kyiv
(60, Volodymyrs’ka Str., 01601 Kyiv, Ukraine; e-mail: engraver@univ.net.ua)
2 Bogolyubov Institute for Theoretical Physics, Nat. Acad. of Sci. of Ukraine
(14b, Metrolohichna Str., Kyiv, 03680, Ukraine)
3 Physics Institute, University of Bayreuth
(95440 Bayreuth, Germany)

Mechanism of Fast Axially Symmetric Reversal of Magnetic Vortex Core

Section: Nanosystems
Original Author's Text: English

Abstract: The magnetic vortex core in a nanodot can be switched by an alternating transversal magnetic field. We propose a simple collective coordinate model, which describes the comprehensive vortex core dynamics, including the resonant behavior, weakly nonlinear regimes, and reversal dynamics. A chaotic dynamics of the vortex polarity is predicted. All analytical results are confirmed by micromagnetic simulations.

Key words: magnetic vortex, nanodot, nanodisk, vortex random-access memories.