  In this study, the influence of Pd and Pt insertion layers in Co/Ni
multilayers (MLs) on their magnetic properties, e.g. magnetic anisotropies,
saturation magnetization, coercivity, magnetic domain size, and Curie
temperature, is investigated. We compare three series of [Co/Ni/X]N ML systems
(X = Pd, Pt, no insertion layer), varying the individual Co layer thickness as
well as the repetition number N. All three systems behave very similarly for
the different Co layer thicknesses. For all systems, a maximum effective
magnetic anisotropy was achieved for MLs with a Co layer thickness between 0.15
nm and 0.25 nm. The transition from an out-of-plane to an in-plane system
occurs at about 0.4 nm of Co. While [Co(0.2 nm)/Ni(0.4 nm)]N MLs change their
preferred easy magnetization axis from out-of-plane to in-plane after 6 bilayer
repetitions, insertion of Pd and Pt results in an extension of this transition
beyond 15 repetitions. The maximum effective magnetic anisotropy was more than
doubled from 105 kJ/m3 for [Co/Ni]3 to 275 and 186 kJ/m3 for Pt and Pd,
respectively. Furthermore, the insertion layers strongly reduce the initial
saturation magnetization of 1100 kA/m of Co/Ni MLs and lower the Curie
temperature from 720 to around 500 K
