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Dipolar effects on soliton dynamics on a discrete ferromagnetic chain
Jean-Pierre Nguenang1, Aurelien Jiotsa Kenfack, Timoléon Créprin Kofané
1Laboratoire de Mécanique, Faculté des Sciences, Université de Yaoundé I, B.P. 812, Yaoundé, Cameroon. nguenang@yahoo.com
Summary
Dipole-dipole interactions influence soliton dynamics in a discrete Heisenberg ferromagnet. Numerical simulations reveal five distinct energy-velocity branches for nonlinear excitations.
Area of Science:
- Condensed Matter Physics
- Magnetism
- Nonlinear Dynamics
Background:
- Solitons are localized waves that maintain their shape and propagate without dispersion.
- Heisenberg ferromagnets exhibit complex magnetic behaviors influenced by various interactions.
- Discrete systems introduce unique characteristics to wave propagation compared to continuous ones.
Purpose of the Study:
- To numerically investigate the impact of dipole-dipole interactions on soliton dynamics.
- To analyze the influence of biquadratic exchange, Zeeman energy, and uniaxial anisotropy.
- To characterize the energy-velocity relationships of solitons and their excitations.
Main Methods:
- Numerical simulation of soliton dynamics in a one-dimensional discrete easy-plane Heisenberg ferromagnet.
- Analysis of single soliton propagation.
- Simulation of soliton-antisoliton pair collisions.
Main Results:
- Dipole-dipole interactions significantly affect soliton dynamics.
- Energy-velocity curves for solitons exhibit five distinct branches.
- These branches correspond to different types of nonlinear elementary excitations.
Conclusions:
- The study elucidates the role of dipole-dipole interactions in soliton behavior.
- The observed five branches highlight the rich variety of nonlinear excitations in this magnetic system.
- Findings contribute to understanding complex dynamics in discrete magnetic chains.