One-dimensional dynamics of domain walls in a three-layer ferromagnetic structure with different parameters of magnetic anisotropy and exchange of the layers

The one-dimensional nonlinear dynamics of a domain wall under the effect of an external dc magnetic field in three-layer ferromagnets with different values of the parameters of magnetic anisotropy and exchange in the layers has been studied theoretically. Equations of motion for the coordinate of th...

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Bibliographic Details
Published in:Physics of metals and metallography 2014-02, Vol.115 (2), p.117-123
Main Authors: Ekomasov, E. G., Murtazin, R. R., Nazarov, V. N.
Format: Article
Language:English
Subjects:
Analysis
Anisotropy
Chemistry and Materials Science
Domain walls
Electrical and Magnetic Properties
Equations of motion
Ferromagnetism
Magnetic anisotropy
Magnetic fields
Materials Science
Mathematical analysis
Mathematical models
Metallic Materials
Nonlinear dynamics
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Summary:The one-dimensional nonlinear dynamics of a domain wall under the effect of an external dc magnetic field in three-layer ferromagnets with different values of the parameters of magnetic anisotropy and exchange in the layers has been studied theoretically. Equations of motion for the coordinate of the center of a domain wall and for the velocity of its motion after passage from one layer into another has been found using perturbation-theory methods. It is shown that, in the case of small defects, the analytical results agree well with the numerical results. The minimum velocity required for a domain wall to pass from one layer into another has been found numerically as a function of the parameters of the material.
ISSN:0031-918X
1555-6190
DOI:10.1134/S0031918X14020069