AI Article Synopsis
- - The study measures how fast domain walls move in permalloy nanowires when an electric current is applied, specifically in a zero magnetic field.
- - As the current density increases, the speed of these walls rises, peaking at about 110 m/s when the current density hits around 1.5 x 10^8 A/cm^2.
- - The observed speeds surpass what can be explained just by spin angular momentum from electrons, implying that other forces like linear momentum transfer might be influencing the motion of the domain walls.
Article Abstract
The velocity of domain walls driven by current in zero magnetic field is measured in permalloy nanowires using real-time resistance measurements. The domain wall velocity increases with increasing current density, reaching a maximum velocity of approximately 110 m/s when the current density in the nanowire reaches approximately 1.5 x 10(8) A/cm(2). Such high current driven domain wall velocities exceed the estimated rate at which spin angular momentum is transferred to the domain wall from the flow of spin polarized conduction electrons, suggesting that other driving mechanisms, such as linear momentum transfer, need to be taken into account.
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| http://dx.doi.org/10.1103/PhysRevLett.98.037204 | DOI Listing |
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