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Effect of nanoscale magnetic coating on the dynamic rearrangement of domain wall structures in magnetic microwires
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DOI：10.1016/j.jsamd.2026.101208.png)
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Abstract
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We investigate the influence of magnetic Co coatings on the mobility of magnetic domain walls in glass-coated Fe-rich amorphous microwires. By combining fluxmetric measurements and the Sixtus-Tonks method, we analyze how coatings of different thickness modify magnetization reversal and domain wall propagation. Magnetic cobalt coatings affect domain wall dynamics via magnetostatic interaction: the stray fields generated by the Co shell superimpose with the external field, producing a smooth, field-dependent acceleration of domain wall motion. The velocity enhancement depends on coating thickness and geometry, reflecting a balance between domain wall tension, magnetic pressure, and stray field contribution. Analytical and numerical calculations of the stray field generated by a cobalt hollow cylinder provide a physically consistent picture of how a thin magnetic coating may influence domain wall mobility. The edge of the cobalt coating plays a key role in the spatial reorganization of the field, where axial and radial components simultaneously change, and this is proposed as a plausible mechanism for the observed transformation of the domain structure.
Keywords:
Magnetic microwires
Domain wall dynamics
Magnetostatic interaction
Cobalt coating
Domain wall velocity
Magnetization reversal
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