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Magnetic lump motion in saturated ferromagnetic films
Xin-Wei Jin1,2, Shi-Jie Shen2, Zhan-Ying Yang1,3
1School of Physics, Northwest University, Xi'an 710127, China.
Physical Review. E
|February 23, 2022
Summary
This study investigates magnetic soliton propagation in ferromagnetic films, revealing stable magnetic lumps generated from unstable solitons. These lumps exhibit remarkable stability during interactions and under damping effects.
Area of Science:
- Condensed Matter Physics
- Nonlinear Dynamics
- Magnetism
Background:
- Nonlinear wave propagation is crucial in understanding magnetic phenomena.
- Ferromagnetic films exhibit complex magnetic behaviors under external fields.
- Solitons and their stability are key areas of research in nonlinear systems.
Purpose of the Study:
- To analyze the nonlinear propagation of magnetic solitons in ferromagnetic films.
- To investigate the generation and stability of magnetic lumps.
- To explore the effects of damping and inhomogeneous exchange on magnetic lump dynamics.
Main Methods:
- Derivation of a generalized (2+1)-dimensional short-wave asymptotic model.
- Construction of bilinearlike forms for exact soliton solutions.
- Numerical simulations to study lump-soliton and lump-lump interactions.
- Analysis of nonlinear motion under Gilbert damping and inhomogeneous exchange.
Main Results:
- Exact magnetic line soliton solutions were obtained.
- Stable magnetic lumps were generated from unstable solitons under Gaussian disturbance.
- Magnetic lumps demonstrated high stability in shape and velocity during evolution and collisions.
- Gilbert damping caused exponential decay of lump amplitude and velocity.
- Shock waves were generated from lumps when inhomogeneous exchange strength was reduced.
Conclusions:
- The study provides a comprehensive analysis of magnetic soliton and lump dynamics in ferromagnetic films.
- The findings highlight the stability of magnetic lumps and their behavior under various physical effects.
- The research offers insights into nonlinear wave phenomena in magnetic materials.
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