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MA: Fachverband Magnetismus

MA 22: Spin Dynamics / Spin Torque III

MA 22.9: Vortrag

Donnerstag, 25. März 2010, 11:45–12:00, H10

Spin torque and waviness in magnetic multilayers: a bridge between Valet-Fert theory and quantum approaches — •Valentin Rychkov^1,3, Simone Borlenghi¹, Henry Jaffres², Albert Fert², and Xavier Waintal¹ — ¹Nanoelectronics group, Service de Physique de l’Etat Condensé, CEA Saclay F-91191 Gif-sur-Yvette Cedex, France — ²Unité Mixte de Physique CNRS-Thales, Route départementale 128, 91767 Palaiseau Cedex and Université Paris-Sud 91405, Orsay, France — ³Institut fuer Theoretische Physik und Astrophysik Universitaet Wuerzburg Am Hubland D-97074 Wuerzburg Germany

We develop a simple theoretical framework for transport in magnetic multilayers, based on Landauer-Buttiker scattering formalism and Random Matrix Theory. A simple transformation allows one to go from the scattering point of view to theories expressed in terms of local currents and electrochemical potential. In particular, our theory can be mapped onto the well established classical Valet Fert theory for collinear systems. For non collinear systems, in the absence of spin-flip scattering, our theory can be mapped onto the generalized circuit theory. We apply our theory to the angular dependance of spin accumulation and spin torque in non-collinear spin valves.