Comparison Between Top And Bottom Nio-Pinning Spin Valves: Correlation Between The Extraordinary Hall Effect And Resistivity

Comparison of the extraordinary Hall effect (EHE) on top and bottom NiO-pinning Co/Cu/Co spin valves (SVs), has been made in order to investigate the relationship R-s similar to p(n) between the extraordinary Hall coefficient R-s and the resistivity p. Bottom and top spin valves have stronger and weaker specular reflction effects which mainly originate from smoother and rougher Co/NiO interface, respectively. The scaling law R-s similar to p(2), which implies that the side-jump mechanism is the dominant scattering process, works fairly well (n= 1.93 +/- 0.02) in the bottom NiO-pinning spin valve, while it deviates much (n = 1.32 +/- 0.04) in the top one.