Laser-induced surface alloying in nanosized Ni/Ti multilayer structures

► Different multilayer (Ni/Ti) structures were modified by picoseconds Nd:YAG laser. ► Laser-induced alloying was achieved within the heat affected zone (HAZ) of the sample. ► Surface segregation of titanium was followed by formation of thin TiO2 film. ► Ripple structures on the surfaces of the 5- and 10-bilayered samples were recorded.