We systematically investigated the Ni and Co thickness-dependent perpendicular magnetic anisotropy (PMA) coefficient, domain structures, magnetization dynamics of Pt(5 nm)/[Co(t_Co nm)/Ni(t_Ni nm)]5/Pt(1 nm) multilayers by combining four standard characterization techniques. The magnetic-related hysteresis loops obtained from field-dependent M anomalous Hall resistivity (AHR) \r{ho}_xy found th...

We focus on the anomalous Hall effects (AHEs) of Co/Ni multilayers with perpendicular magnetic anisotropy (PMA) by using Ta, Nb, and Cu as buffer top layer. An un-conventional AHE behavior was found in which AH resistance exhibits two anti-symmetric peaks presence a field. Moreover, Ta neighboring layer show reverse compared to Nb layers, except bottom capping layers. The former can be explaine...