Voltage dependence of Landau-Lifshitz-Gilbert damping of a spin in a current driven tunnel junction

Details Voltage dependence of Landau-Lifshitz-Gilbert damping of a spin in a current driven tunnel junction Voltage dependence of Landau-Lifshitz-Gilbert damping of a spin in a current driven tunnel junction

2006-01-10

arxiv.org/abs/cond-mat/0601185v1

Phys. Rev. B 73, 212501(2006)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

6 pages, 3 figures

Scientific paper

10.1103/PhysRevB.73.212501

We present a theory of Landau-Lifshitz-Gilbert damping $\alpha$ for a localized spin ${\vec S}$ in the junction coupled to the conduction electrons in both leads under an applied volatege $V$. We find the voltage dependence of the damping term reflecting the energy dependence of the density of states. We find the effect is linear in the voltage and cotrolled by particle-hole asymmetry of the leads.

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