Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2004-06-03
Phys. Rev. B 70, 174424 (2004)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
10 pages, 5 figures; submitted to Physical Review B
Scientific paper
10.1103/PhysRevB.70.174424
We present a circuit model to describe the electron transport through a domain wall in a ferromagnetic nanowire. The domain wall is treated as a coherent 4-terminal device with incoming and outgoing channels of spin up and down and the spin-dependent scattering in the vicinity of the wall is modelled using classical resistances. We derive the conductance of the circuit in terms of general conductance parameters for a domain wall. We then calculate these conductance parameters for the case of ballistic transport through the domain wall, and obtain a simple formula for the domain wall magnetoresistance which gives a result consistent with recent experiments. The spin transfer torque exerted on a domain wall by a spin-polarized current is calculated using the circuit model and an estimate of the speed of the resulting wall motion is made.
Falloon Peter E.
Jalabert Rodolfo A.
Stamps Robert L.
Weinmann Dietmar
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