Micromagnetic understanding of current-driven domain wall motion in patterned nanowires

In order to explain recent experiments reporting a motion of magnetic domain walls (DW) in nanowires carrying a current, we propose a modification of the spin transfer torque term in the Landau-Lifchitz-Gilbert equation. We show that it explains, with reasonable parameters, the measured DW velocitie...

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Bibliographic Details
Published in:Europhysics letters 2005-03, Vol.69 (6), p.990-996
Main Authors: Thiaville, A, Nakatani, Y, Miltat, J, Suzuki, Y
Format: Article
Language:English
Subjects:
72.25.Ba
72.25.Pn
75.70.Kw
Condensed Matter
Materials Science
Physics
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Summary:In order to explain recent experiments reporting a motion of magnetic domain walls (DW) in nanowires carrying a current, we propose a modification of the spin transfer torque term in the Landau-Lifchitz-Gilbert equation. We show that it explains, with reasonable parameters, the measured DW velocities as well as the variation of DW propagation field under current. We also introduce coercivity by considering rough wires. This leads to a finite DW propagation field and finite threshold current for DW propagation, hence we conclude that threshold currents are extrinsic. Some possible models that support this new term are discussed.
ISSN:0295-5075
1286-4854
DOI:10.1209/epl/i2004-10452-6