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H. Forster, T. Schrefl, W. Scholz, D. Süss, V. Tsiantos, J. Fidler:
"Micromagnetic simulation of domain wall motion in magnetic nano-wires";
Journal of Magnetism and Magnetic Materials, 249 (2002), 181 - 186.

Micromagnetic simulation of domain wall motion in magnetic nano-wires

H. Forster [Corresponding Author Contact Information] , [E-mail The Corresponding Author] , [E-mail The Corresponding Author] , T. Schrefl, W. Scholz, D. Suess, V. Tsiantos and J. Fidler

Institut für Angewandte und Technische Physik, Vienna University of Technology, Wiedner Hauptstr. 8-10, A-1040, Vienna, Austria

Available online 8 August 2002.

Abstract

The magnetization reversal process of magnetic nano-wires was investigated using a moving mesh finite element method. The nucleation and expansion of reversed domains is calculated by solving the Gilbert equation of motion. For a wire diameter of d=20 nm either a transverse wall or a vortex wall is formed, depending on the strength of the initial applied field. Once a reversed domain is nucleated, the wall configuration remains the same during the complete reversal process. The vortex wall moves faster than the transverse wall. The domain wall velocities are in the order of 300?800 m/s for an external field in the range from 300 to 600 kA/m for a Gilbert damping constant [small alpha, Greek] =1. The domain wall velocity increases with increasing wire diameter and decreasing damping constant, reaching 2000 m/s for d=40 nm, [small alpha, Greek] =0.05, and an applied field of 250 kA/m.

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