Effect of anisotropies on the magnetization dynamics

Pérez, L. M., Bragard, J., Mancini, H., Gallas, J. A. C., Cabanas, A. M., Suarez, O. J. and Laroze, D. (2015) Effect of anisotropies on the magnetization dynamics. Networks and Heterogeneous Media, 10(1), pp. 209-221. (doi: 10.3934/nhm.2015.10.209)

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Abstract

We report a systematic investigation of the magnetic anisotropy effects observed in the deterministic spin dynamics of a magnetic particle in the presence of a time-dependent magnetic field. The system is modeled by the Landau-Lifshitz-Gilbert equation and the magnetic field consists of two terms, a constant term and a term involving a harmonic time modulation. We consider a general quadratic anisotropic energy with three different preferential axes. The dynamical behavior of the system is represented in Lyapunov phase diagrams, and by calculating bifurcation diagrams, Poincaré sections and Fourier spectra. We find an intricate distribution of shrimp-shaped regular island embedded in wide chaotic phases. Anisotropy effects are found to play a key role in defining the symmetries of regular and chaotic stability phases.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Laroze, Dr David
Authors: Pérez, L. M., Bragard, J., Mancini, H., Gallas, J. A. C., Cabanas, A. M., Suarez, O. J., and Laroze, D.
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Networks and Heterogeneous Media
Publisher:American Institute of Mathematical Sciences
ISSN:1556-1801
ISSN (Online):1556-181X

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
629961Artificial spin ice: designer matter far from equilibriumRobert StampsEngineering & Physical Sciences Research Council (EPSRC)EP/L002922/1S&E P&A - PHYSICS & ASTRONOMY