Circuit model for domain walls in ferromagnetic nanowires: Application to conductance and spin transfer torques

Peter Falloon, R.A. Jalabert, D. Weinmann, Robert Stamps

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

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 four-terminal device with incoming and outgoing channels of spin up and down and the spin-dependent scattering in the vicinity of the wall is modeled 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.
Original languageEnglish
Pages (from-to)174424-1-174424-9
JournalPhysical Review B
Volume70
Issue number17
DOIs
Publication statusPublished - 2004

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