Origin of Intrinsic Gilbert Damping
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Hickey-2009-Origin of Intrinsic.pdf
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750.96 KB
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Author(s)
Hickey, Mark
Moodera, Jagadeesh
Date Issued
March 2009
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
Hickey, M. C., and J. S. Moodera. “Origin of Intrinsic Gilbert Damping.” Physical Review Letters 102.13 (2009): 137601. © 2009 The American Physical Society.
Version
Final published version
Abstract
The damping of magnetization, represented by the rate at which it relaxes to equilibrium, is successfully modeled as a phenomenological extension in the Landau-Lifschitz-Gilbert equation. This is the damping torque term known as Gilbert damping and its direction is given by the vector product of the magnetization and its time derivative. Here we derive the Gilbert term from first-principles by a nonrelativistic expansion of the Dirac equation. We find that this term arises when one calculates the time evolution of the spin observable in the presence of the full spin-orbital coupling terms, while recognizing the relationship between the curl of the electric field and the time-varying magnetic induction.
MIT Department
Francis Bitter Magnet Laboratory (Massachusetts Institute of Technology)
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DOI of Published Version
http://dx.doi.org/10.1103/PhysRevLett.102.137601
