A sub-monolayer of Co90Fe10, Ni80Fe 20, Ta, Cu or Ru was investigated for a spin valve having a Co 90Fe10 free layer. The sub-monolayers of Co 90Fe10, Ni80Fe20, Cu and Ta did not significantly improve the giant magnetoresistance of the spin valve, probably because the spin-dependent scattering due to localized potentials at the Fe impurity in a Co free layer, rather than scattering at the other impurities, dominates the spin valve's magnetoresistance response. As a result of this dominance, the effect of such a sub-monolayer cannot be pronounced, However, since there was some improvement in all but one case, the results clearly confirm that such a layer can play a role as a spin-dependent scatterer. In the case of Ru, the sub-monolayer greatly decreased the giant magnetoresistance value, and this is direct evidence that Ru is indeed a suppressor of bulk spin-dependent scattering.
All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)