Current-driven electromagnetic soliton collision in a ferromagnetic nanowire

Area of Science:

• Physics
• Materials Science
• Electromagnetism

Background:

• Investigating electromagnetic wave propagation in ferromagnetic nanowires is crucial for spintronic device development.
• The spin transfer torque effect significantly influences magnetization dynamics in such systems.
• Understanding these dynamics requires coupling the Landau-Lifshitz-Gilbert (LLG) equation with Maxwell's equations.

Purpose of the Study:

• To analyze electromagnetic wave propagation in a uniaxial ferromagnetic nanowire under spin transfer torque.
• To derive a model describing magnetization dynamics and electromagnetic wave interaction.
• To explore the impact of electric current on soliton solutions and collisions.

Main Methods:

• A nonuniform multiscale analysis was applied to the coupled LLG-Maxwell equations.
• The extended derivative nonlinear Schrödinger (DNLS) equation was derived.
• Multisoliton solutions were constructed using the Hirota bilinearization procedure.

Main Results:

• The coupled LLG-Maxwell equations were reduced to an extended DNLS equation.
• The study successfully constructed multisoliton solutions for the derived DNLS equation.
• The possibility of soliton collisions under electric current was investigated.

Conclusions:

• The derived extended DNLS equation provides a framework for studying magnetization dynamics and wave propagation.
• The research demonstrates the influence of electric current on soliton behavior in ferromagnetic nanowires.
• This work contributes to the understanding of soliton dynamics in spintronic systems.