Dresden 2009 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 37: Spin Dependent Transport Phenomena

MA 37.6: Vortrag

Donnerstag, 26. März 2009, 16:30–16:45, HSZ 403

Temperature dependent non local spin precession in lateral all-metal spin valves — •Jeannette Wulfhorst, Andreas Vogel, and Guido Meier — Institut für Angewandte Physik und Zentrum für Mikrostrukturforschung, Universität Hamburg, Jungiusstrasse 11, 20355 Hamburg, Germany

All-metal spin-valve devices are studied to determine spin-dependent effects in normal metals. The non local spin-valve effect has been measured with spin-valve devices consisting of permalloy, copper or aluminum, and aluminumoxide. With a perpendicular external magnetic field the Hanle effect, i.e. spin precession of the electrons injected into a normal metal, is observed [1]. Transport measurements at various temperatures have been performed. Spin-dependent phenomena, namely the non local spin-valve effect and spin precession, are observed. A theoretical description of spin-dependent transport is presented including spin diffusion, spin relaxation, spin precession, and tunnel barriers. From the comparison of the experimentally observed spin precession to the theoretical description, we obtain a spin-relaxation time of 78 ps and a spin-relaxation length of 703 nm in aluminum. In copper a spin-relaxation time of 68 ps and a spin-relaxation length of 2571 nm are determined.

[1] A. van Staa, J. Wulfhorst, A. Vogel, U. Merkt, and G. Meier,

Phys. Rev. B 77, 214416 (2008)