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Abstract:
In the strive to find a straightforward method for determining the spin
polarization, the analysis of the Andreev reflection process in point
contact junctions has attracted much interest. However, the prerequisite
for an evaluation of the transport spin polarization in this scheme is
the existence of elastic (ballistic or diffusive) transport, which
cannot be assumed a priori. We therefore also include inelastic
processes in our analysis and exemplify that thermal effects can have a
significant effect on data evaluation. As ferromagnetic samples with a
predicted half metallic behavior and comparably low conductivity we used
thin films of the double perovskite Sr2FeMoO6 and bulk material of the
Heusler compound Co2Cr0.6Fe0.4Al.
