Dresden 2006 – wissenschaftliches Programm

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MA: Magnetismus

MA 20: Poster: Films(1-36) Transp(37-56) Ex.Bias(57-67) Spindyn(68-80) Micromag(81-95) Particle(96-109) Imag.+Surface(110-113) Spinelectr(114-122) Theory+Micromag(123-131) Spinstr+Aniso(132-142) MagMat(143-156) Meas(157,158) MolMag+Kondo(159-162) Postdead(163-)

MA 20.39: Poster

Dienstag, 28. März 2006, 15:15–19:15, P1

Spin-flip scattering cross sections of point defects in 3d metals — •Peter Zahn, Dmitry Fedorov, and Ingrid Mertig — Fachbereich Physik, Martin Luther University Halle, D-06099 Halle

An important ingredient for the microscopic understanding of spin diffusion processes in magnetic nanostructures is the spin diffusion length. It is strongly influenced by the spin-flip scattering length. We restrict our considerations to T=0 and focus on the spin-flip scattering at point defects only. The electronic structure of the host material and the defects is calculated self-consistently in the framework of scalar-relativistic density-functional theory by a KKR Green’s function method. The transition probability of the electronic states is evaluated using the microscopic scattering matrix. The non-spin-conserving part of the scattering matrix is obtained in first order perturbation theory by the spin-orbit-coupling matrix elements. So, the momentum and spin scattering lengths are obtained without adjustable parameters.
The qualitative behaviour of the obtained spin-flip scattering cross sections for 3d bulk materials and ultrathin layers will be discussed. The impact on the spin-mixing resistivity and the influence of the reduced dimensionality will be elucidated.