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Modulational instability and gap solitons in periodic ferromagnetic films

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Abstract

The modulational instability and gap solitons are theoretically studied in the ferromagnetic films under a periodic magnetic field. By multiple scale expansion, the envelope soliton solutions are obtained naturally. Due to the periodic modulation of dispersion, the solitons may be pushed into the gap region. For the easy-axis magnetic film, the red-shift of frequency leads to a modulational instability in the bottom of band and generates a bright gap soliton. For the easy-plane case, the blue-shift leads to an instability in the top of band and a dark gap soliton emerges. The weak dam** produces an attenuation factor and a small oscillation.

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Authors and Affiliations

  1. College of Physics and Microelectronics Science, Key Laboratory for Micro-Nano Physics and Technology of Hunan Province, Hunan University, Changsha, 410082, P.R. China

    P. B. He, G. N. Gu & A. L. Pan

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  1. P. B. He
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  2. G. N. Gu
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  3. A. L. Pan
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Correspondence to P. B. He.

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He, P.B., Gu, G.N. & Pan, A.L. Modulational instability and gap solitons in periodic ferromagnetic films. Eur. Phys. J. B 85, 119 (2012). https://doi.org/10.1140/epjb/e2012-30080-8

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