Dynamics of Domain Walls in Soft Magnetic Nanostripes: Topological Soliton Approach

The motions of different types of domain walls (DWs) driven by direct current (dc) magnetic field in soft magnetic nanostripes were calculated. The DWs exhibit steady and transient motions in the low fields and oscillations of their internal structure above a critical field. A developed soliton mode...

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Bibliographic Details
Published in:IEEE transactions on magnetics 2008-11, Vol.44 (11), p.3079-3082
Main Authors: Guslienko, K.Yu, Jun-Young Lee, Sang-Koog Kim
Format: Article
Language:English
Subjects:
Cross-disciplinary physics: materials science
rheology
Direct current
Domain walls (DWs) motion
Dynamics
Exact sciences and technology
Frequency
Magnetic devices
Magnetic domain walls
Magnetic domains
Magnetic fields
Magnetism
Magnetostatics
Materials science
Mathematical models
Nanocomposites
Nanomaterials
Nanoscale devices
nanostripes
Nanostructure
Oscillations
Other topics in materials science
Physics
Predictive models
Soft magnetic materials
Solitons
topological soliton
vortex
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Summary:The motions of different types of domain walls (DWs) driven by direct current (dc) magnetic field in soft magnetic nanostripes were calculated. The DWs exhibit steady and transient motions in the low fields and oscillations of their internal structure above a critical field. A developed soliton model of the walls explains their dynamics by the motions of a limited number of magnetic topological solitons having nonzero gyrovectors such as vortex and antivortex. The model predicts the reduced DW velocity and critical field in the low-field regime, and increased wall-oscillation frequency in nanostripes, compared to the Walker solution for bulk magnets. The critical field and velocity are determined by the nanostripe thickness and width, whereas the oscillation frequency depends only on the field strength.
ISSN:0018-9464
1941-0069
DOI:10.1109/TMAG.2008.2002775