Nonequilibrium Extension of the Landau-Lifshitz-Gilbert Equation for Magnetic Systems

Details Nonequilibrium Extension of the Landau-Lifshitz-Gilbert Equation for Magnetic Systems Nonequilibrium Extension of the Landau-Lifshitz-Gilbert Equation for Magnetic Systems

2004-05-26

arxiv.org/abs/cond-mat/0405599v1

Physics

Condensed Matter

Other Condensed Matter

RevTex 3 Pages in double column; no figure

Scientific paper

Using the invariant operator method for an effective Hamiltonian including the radiation-spin interaction, we describe the quantum theory for magnetization dynamics when the spin system evolves nonadiabatically and out of equilibrium, $d \hat{\rho}/dt \neq 0$. It is shown that the vector parameter of the invariant operator and the magnetization defined with respect to the density operator, both satisfying the quantum Liouville equation, still obey the Landau-Lifshitz-Gilbert equation.

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