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Publication Citation: Adiabatic Domain Wall Motion and Landau-Lifshitz Damping

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Author(s): Mark D. Stiles; Wayne M. Saslow; Michael J. Donahue; A Zangwill;
Title: Adiabatic Domain Wall Motion and Landau-Lifshitz Damping
Published: January 01, 2007
Abstract: Recent theory and measurements of the velocity of current-driven domain walls in magnetic nanowires have re-opened the unresolved question of whether Landau-Lifshitz damping or Gilbert damping provides the more natural description of dissipative magnetization dynamics. In this paper, we argue that (as in the past) experiment cannot distinguish the two, but that Landau- Lifshitz damping nevertheless provides the most physically sensible interpretation of the equation of motion. From this perspective, (i) adiabatic spin-transfer torque dominates the dynamics with small corrections from non-adiabatic effects; (ii) the damping always decreases the magnetic free energy, and (iii) microscopic calculations of damping become consistent with general statistical and thermodynamic considerations.
Citation: Physical Review B (Condensed Matter and Materials Physics)
Volume: 75
Issue: 21
Keywords: current-induced domain wall motion;dissipation;irreversible processes;Landau-Lifshitz-Gilbert equation;magnetization dynamics
Research Areas: Nanomagnetics
PDF version: PDF Document Click here to retrieve PDF version of paper (151KB)