Transport and magnetic properties of magnetic alloy atom bridge

We have investigated the transport and magnetic properties of the atom bridge made from magnetic materials, which is the atom-scale wire constructed between a scanning tunneling microscopy tip and a solid surface, with ab initio calculations. In the case of FeNi alloy bridges, we have found that the atoms in the bridges can be designed to have significantly larger magnetic moment than that in the corresponding alloy bulk. We discuss about the origin of their transport properties in order to design the spin-polarized electron current through the bridges.