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We evidenced unconventionnal Anomalous Hall Effects (AHE) in 3d/5d(Co0.2nm/Ni0.6nm)N multilayers grown on a thin Pt layer or thin Au:W alloy. Theinversion observed on AHE originates from the opposite sign of the spin-orbitcoupling of Pt compared to Ni. Via advanced simulations methods for thedescription of the spin-current profiles based on the spin-dependent Boltzmannformalism, we extracted the spin Hall angle (SHA) of Pt and (Co/Ni) as well asthe relevant transport parameters. The extracted SHA for Pt, +20%, is oppositeto the one of (Co/Ni), giving rise to an effective AHE inversion for thin(Co/Ni) multilayers (N < 17). The spin Hall angle in Pt is found to be largerthan the one previously measured in combined spin-pumping inverse spin-Halleffect experiments in a geometry of current perpendicular to plane. Whereasmagnetic proximity effects cannot explain the effect, spin-current leakage andanisotropic electron scattering at Pt/(Co,Ni) interfaces fit the experiments.

Unconventional anomalous Hall effect in 3d/5d multilayers mediated by the nonlocal spin-conductivity