Volume 78, Number 5, June 2007
|Number of page(s)||6|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||31 May 2007|
Domain wall mobility, stability and Walker breakdown in magnetic nanowires
Laboratoire de Physique des Solides, Université Paris-Sud, CNRS, UMR 8502, F-91405 Orsay Cedex, France
2 School of Physics, MO13, University of Western Australia - 35 Stirling Highway, Crawley, WA 6009, Australia
Corresponding author: email@example.com
Accepted: 26 April 2007
We present an analytical calculation of the velocity of a single domain wall in a magnetic structure with reduced thickness and/or lateral dimension under the combined action of an external applied magnetic field and an electrical current. As for the case of field-induced domain wall propagation in thick films, two motion regimes with different mobilities are obtained, below and far above the so-called Walker field. Additionally, for the case of current induced motion, a Walker-like current density threshold is defined. The threshold field and current density, stating the wall's internal structure stability, differ from those in thick films; both are reduced by the same geometrical demagnetising factor which accounts for the confinement. This points out the fact that the velocity dependence over an extended field/current range and the knowledge of the Walker breakdown are mandatory to draw conclusions about the phenomenological Gilbert damping parameter tuning the magnetisation dynamics.
PACS: 75.60.Ch – Domain walls and domain structure / 75.75.+a – Magnetic properties of nanostructures / 72.25.-b – Spin polarized transport
© Europhysics Letters Association, 2007
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