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Dresden 2006 – scientific programme

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MA: Magnetismus

MA 25: Spin-Electronics I

MA 25.11: Talk

Thursday, March 30, 2006, 12:45–13:00, HSZ 103

Spin-dependent transport in hybrid ferromagnetic and nonmagnetic nanowires — •O. Posth, M. Brands, and G. Dumpich — Experimentalphysik, Universität Duisburg-Essen (Campus Duisburg), Lotharstr. 1, 47048 Duisburg

In this work the spinaccumulation effect and the spin relaxation length in different nonmagnetic materials are determined. For this, polycrystalline nanowires are fabricated by means of high-resolution electron beam lithography (HR-EBL) in combination with electron beam evaporation and lift-off-technique. The measurements of the spinaccumulation effect are performed in a nonlocal geometry at T = 4,2 K using cobalt as ferromagnetic material and copper and aluminium as nonmagnetic materials.
To improve the quality of the interface between the cobalt-wire and the nonmagnetic wire oblique evaporation is used. Thus, both the cobalt- and the nonmagnetic wires are fabricated in one deposition-step. The spinaccumulation effect is detected in copper and aluminium and, assuming known values for the polarization of the interface between the ferromagnetic and the nonmagnetic material, an upper and a lower bound for the spin relaxation length can be calculated. In copper a spin relaxation length of 0,75 µm ≤ lSCu ≤ 1,1 µm is found and the spin relaxation length in aluminium is 1,0 µm ≤ lSAl ≤ 1,4 µm.
This work is supported by the DFG within SFB 491.

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