![]() ![]() In these cases, the MgO layer has been inserted at just one of the Cr/Pt (or Cr/Au) contacts. Besides metal/Cr/metal junctions, we have also studied systems with a MgO layer in order to simulate a more realistic device, where an insulating layer is inserted to increase its electrical resistivity. In such a way we minimize the mismatch between the lattices. Since Cr is bcc, while Pt and Au are fcc, and since the ratio between Pt/Au and Cr lattice spacings is close to 2, we rotated the Pt/Au lattices by 45 ∘. All the slabs are obtained by cutting the bulk along the ( 001 ) direction. It is composed by three metal layers: two semi-infinite at the two ends (the leads, Pt or Au) and a finite one of Cr in the middle, with a varying number of mono-layers (ranging between 4 and 16). In order to study the electronic and transport properties and their dependence on the spin orientation, we have considered the device reported in Figure 1. ![]()
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