Fig. 4: Spin densities.

The spin densities of the Ni/HfO₂ interfaces defined as the difference between the majority- and minority-spin charge densities, at the P_in (top panels) and P_out (bottom panels) interfaces for a SDF, b SV-2, and c SD-2 interfaces. The spin densities are shown within the yz-plane and averaged along the x-direction.