11:00 AM, Feb 17, 2011
Sumwalt, Room 120A

Phys. Rev. Lett. 102, 086601 (2009)
Shufeng Zhang and Steven S.-L. Zhang
"Generalization of the Landau-Lifshitz-Gilbert Equation for Conducting Ferromagnets"

We propose an extension of the Landau-Lifshitz-Gilbert (LLG) equation
by explicitly including the role of conduction electrons in
magnetization dynamics of conducting ferromagnets. The temporal and
spatial dependent magnetization order parameter m(r,t) generates both
electrical and spin currents that provide dissipation of the energy and
angular momentum of the processing magnet. The resulting LLG equation
contains highly spatial dependence of damping term and thus
micromagnetic simulations based on the standard LLG equation should be
reexamined for magnetization dynamics involving narrow domain walls and
spin waves with short wavelengths.