Berlin 2008 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 11: Spindependent Transportphenomena II

MA 11.3: Vortrag

Montag, 25. Februar 2008, 15:45–16:00, H 0112

Time-dependent spin transport through ferromagnet-metal junction — •Yao-Hui Zhu and Hans Christian Schneider — Physics Department, Kaiserslautern University of Technology, Germany

Time-dependent spin transport is studied theoretically for magnetic multilayers using a dynamical version of the Valet-Fert theory [1]. Starting from a Boltzmann transport equation we find the equivalent of a telegraph equation for the spin current. The wave character inherent in this type of equation enables us to define a finite propagation velocity for spin-switching processes. We show that spin diffusion can be regarded as an approximation of the diffusion-wave behavior of spin transport in the long-time limit. We analyze magnetization switching, current reversal and alternating currents for ferromagent-normal metal contancts.

[1] T. Valet and A. Fert, Phys. Rev. B. 48, 7099 (1993).