Regensburg 2007 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 10: Spinelectronics/Spininjection in Heterostructures

MA 10.10: Vortrag

Montag, 26. März 2007, 17:30–17:45, H23

Hot electron transport in fully epitaxial FeCo/Au/FeCo-spin-valves using (Scattering) Ballistic Electron Magnetic Microscopy — •Emanuel Heindl, Christian Back, and Johann Vancea — Department of Physics, Universität Regensburg, D-93040 Regensburg

The transport of nonequilibrium (hot) electrons in FeCo/Au/FeCo spin-valves epitaxially grown on n-GaAsP has been studied at room temperature by the local technique (scattering) ballistic electron magnetic microscopy BEMM (SBEMM).

A STM-tip injects hot electrons into the spin-valve (BEMM-mode), where they undergo spin-dependent scattering processes. Thus the inelastic decay of the nonequilibrium electrons varies for parallel and antiparallel magnetization configuration of the spin-valve. On our fully epitaxial FeCo/Au/FeCo spin-valves we obtained magnetocurrent effects of up to 600% and relative high transmission values compared to similar studies. Unwanted scattering processes within the spin-valve are reduced to a minimum due to its epitaxial structure.

By reversing the tunnel-voltage hot holes are injected into the spin-valve (scattering BEMM-mode). In this mode a signal can only be created via the excitation of electron hole pairs. This excitation spectroscopy (SBEMM) gives insights into the electron-electron-scattering processes within the spin-valve. On our epitaxial spin-valve we also found a dependence on the magnetization configuration of the spin-valve with magnetocurrents of several hundred percent.