Berlin 2008 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 25: Invited Talks Woltersdorf / Meier / Rasing

MA 25.1: Hauptvortrag

Donnerstag, 28. Februar 2008, 12:00–12:30, EB 301

Magnetization dynamics due to pure spin currents — •Georg Woltersdorf¹, Olexandr Mosendz², Christian H. Back¹, and Bret Heinrich² — ¹Physik, Universität Regesburg, Universitätsstraße 31, 93040 Regensbug, Germany — ²Physics Department, Simon Fraser University, 8888 University Drive, V5A 1S6 Burnaby, B.C., Canada

The magnetization dynamics in magnetic double layers is affected by spin-pump and spin-sink effects. So far, only the spin-pumping and its effect on the magnetic damping was studied. However, due to conservation of angular momentum this spin current also leads to magnetic excitation of the layer dissipating this angular momentum (spin-sink). We use the time resolved magneto-optic Kerr effect to directly show the excitation due to the pure spin current. In particular, we observe magnetization dynamics due to the transfer of spin angular momentum in magnetic double layers. In contrast to other experiments where a spin polarized charge current is passed through a nanomagnet this effect is based on pure spin currents without net transfer of electric charge.

In addition it is shown that this effect can be used to estimate the spin diffusion length of the non-magnetic spacer material.