Regensburg 2010 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 10: Poster I
MA 10.27: Poster
Dienstag, 23. März 2010, 10:45–13:45, Poster A
Dynamics of driven multiferroic heterostructures — •Alexander Sukhov1, Chenglong Jia1, Paul Horley2, and Jamal Berakdar1 — 1Institut für Physik, Martin-Luther-Universität Halle-Wittenberg, Heinrich-Damerow-Str. 4, 06120 Halle/Saale, Germany — 2Centro de Fisica das Interaccoes Fundametais Instituto Superior Tecnico, Av. Rovisco Pais, 1049-001 Lisboa, Portugal
We study theoretically a ferromagnet (FM) coupled to a ferroelectric (FE) material via a multiferroic coupling. The magnetization dynamics in the ferromagnetic part is described in a standard way via the Landau-Lifshitz-Gilbert equation at finite temperatures with a dynamical driving term arising from the multiferroic coupling. Hence, an electric field that acts on the electric polarization triggers a magnetization dynamics. The ferroelectric dynamics is considered in the framework of the Landau theory of phase transitions and is governed by the Landau-Kholmogorov equation [1] augmented with a dynamical part that stems from the coupling to the ferromagnet, i.e. a magnetic field affects the polarization dynamics. We inspect how the nature of the multiferroic coupling, e.g. [2], is manifested in the time evolution of the order parameters.
[1] D. Ricinschi, C. Harnagea, C. Papusoi, L. Mitoseriu, V. Tura and M. Okuyama, J. Phys.: Condens. Matter 10, 477 (1998); [2] T. Cai, S. Ju, J. Lee, N. Sai, A. A. Demkov, Q. Niu, Z. Li, J. Shi and E. Wang, Phys. Rev. B 80, 140415(R) (2009).