Dresden 2006 – wissenschaftliches Programm
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MA: Magnetismus
MA 25: Spin-Electronics I
MA 25.11: Vortrag
Donnerstag, 30. März 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.