Spin pumping by a field-driven domain wall

Details Spin pumping by a field-driven domain wall Spin pumping by a field-driven domain wall

2007-06-21

arxiv.org/abs/0706.3160v3

Phys. Rev. B 77, 014409 (2008)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 1 figure v2: some typos corrected v3: published version

Scientific paper

10.1103/PhysRevB.77.014409

We calculate the charge current in a metallic ferromagnet to first order in the time derivative of the magnetization direction. Irrespective of the microscopic details, the result can be expressed in terms of the conductivities of the majority and minority electrons and the non-adiabatic spin transfer torque parameter $\beta$. The general expression is evaluated for the specific case of a field-driven domain wall and for that case depends strongly on the ratio of $\beta$ and the Gilbert damping constant. These results may provide an experimental method to determine this ratio, which plays a crucial role for current-driven domain-wall motion.

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