Magnetic domain wall dynamics in a permalloy nanowire

• Published in: IEEE transactions on magnetics Vol. 39; no. 5; pp. 2663 - 2665
• Main Authors: Atkinson, D., Allwood, D.A., Faulkner, C.C., Gang Xiong, Cooke, M.D., Cowburn, R.P.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: New York, NY IEEE 01-09-2003; Institute of Electrical and Electronics Engineers; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Applied sciences; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Domain effects, magnetization curves, and hysteresis; Domain walls and domain structure; Exact sciences and technology; Magnetic confinement; Magnetic domain walls; Magnetic domains; Magnetic field measurement; Magnetic properties and materials; Magnetic separation; Magnetism; Magnetization reversal; Metals. Metallurgy; Milling; Optical propagation; Physics; Pulse measurements; Strips; External fields; Permalloy; Thermal activation; Magnetic domains; Domain walls; Magnetic field effects; Magnetic structure; Domain wall motion; Nanostructures; Experimental study; Nanostructured materials; magnetic nanostructure
• ISSN: 0018-9464; 1941-0069
• DOI: 10.1109/TMAG.2003.815548

Experimental results of domain wall propagation velocity as a function of applied field in a 200-nm-wide permalloy nanostructure are presented. The structure was fabricated by focused-ion beam milling and designed to separate the domain wall nucleation from propagation. The measured velocities are very high, up to 1500 m/s at 49 Oe and the field dependence of the velocity is interpreted in terms of thermally activated wall motion through a series of pinning sites and a wall geometry that changes as a function of field.