Experimentally tailoring s-d and p-d interactions in spin polarization via post deposition annealing conditions

• The intrinsic point defects dependent magneto-electrical properties of 10 mol% Co doped ZnO thin films.
• The relation between post deposition annealing and anomalous Hall Effect in thin films.
• The effect of s(p) – d interactions on polarized spin currents.

We investigated magneto-electrical properties and the effect of intrinsic point defects in the lattice on film properties of 10 mol% cobalt containing ZnO thin films that were doped with 0.7 ± 0.1 to 1.1 ± 0.2 mol% W atoms. Thin films were deposited on Si (100) substrates. The anomalous Hall Effect seen in magneto-electrical measurements indicated a correlation between the polarized spins and the positive magneto-resistivity due to hole and electron mediated interactions. N-type carriers were dominant in conductivity, as shown by Hall resistance measurements. The 55 % positive magneto-resistivity and the split of 132.3 ± 0.1 Ω and 28.5 ± 0.1 Ω differences in the magneto-hysteresis curves through both negative and positive regions, respectively, proved that a polarized spin current was effectively formed under both s-d and p-d interactions. In addition, the shallow energy levels, close to extreme points of conduction and valance bands, reinforced the polarized spin current.

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