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Magnetic Domain Walls in Nanowires

Published online by Cambridge University Press:  31 January 2011

Rolf Allenspach  and
Pierre-Olivier Jubert
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Abstract

For many decades, it was assumed that the characteristics of magnetic domain walls were determined by material properties and the walls were moved by magnetic fields.In the past few years, it has been shown that domain walls behave differently on the nanometer scale.Domain walls in small elements exhibit complex spin arrangements that strongly deviate from the wall types commonly encountered in magnetic thin-film systems, and they can be modified by changing the geometry of the element.Domain walls in nanowires can also be moved by injecting electrical current pulses.Whereas wall propagation is qualitatively explained by a spin transfer from the conduction electrons to the spins of the domain wall, important aspects of the observations cannot be explained by present models.Examples include the observation of a drastic transformation of the wall structure upon current injection and domain wall velocities that tend to be orders of magnitude smaller than anticipated from theory.

Keywords

magnetic propertiesnanoscale
Type
Research Article
Information
MRS Bulletin , Volume 31 , Issue 5: Materials for Magnetic Data Storage , May 2006 , pp. 395 - 399
Copyright
Copyright © Materials Research Society 2006

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