Abstract
We study the conductance of single atom point contacts made between a gold STM tip and a gold layer evaporated on top of the half-metallic ferromagnetic manganite La 2/3Sr 1/3MnO 3. The conductance histogram shows the typical peak corresponding to the last gold contact before rupture at a value smaller than the quantum of conductance, indicating that the current through the single atom contact is partially spin polarized. We discuss the possible use of this effect as a method to measure the spin polarization of spin active electronic devices.
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