Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2006-11-20
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
9 pages, 5 figures
Scientific paper
10.1103/PhysRevB.76.024404
Transport currents can alter alter order parameter dynamics and change steady states in superconductors, in ferromagnets, and in hybrid systems. In this article we present a scheme for fully microscopic evaluation of order parameter dynamics that is intended for application to nanoscale systems. The approach relies on time-dependent mean-field-theory, on an adiabatic approximation, and on the use of non-equilibrium Greens function (NEGF) theory to calculate the influence of a bias voltage across a system on its steady-state density matrix. We apply this scheme to examine the spin-transfer torques which drive magnetization dynamics in Co/Cu/Co spin-valve structures. Our microscopic torques are peaked near Co/Cu interfaces, in agreement with most previous pictures, but suprisingly act mainly on Co transition metal $d$-orbitals rather than on $s$-orbitals as generally supposed.
Duine Rembert A.
Guo Huaiming
Haney Paul M.
MacDonald Allan. H.
Nunez Alvaro S.
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