Формирование, структурные и магнитные изменения при отжиге пленок, полученных лазерным распылением Ni и Pd

Abstract

The electron microscopy investigations of Pd, Ni and nickel–palladium alloy films were carried out. The films were produced by laser sputtering of one and two element metal targets. It was shown that in the case of alternate deposition of nickel and palladium the polycrystalline films with metastable hcp lattice were formed. The parameters of hcp lattice increase monotonically when the content of palladium rises. As a result of annealing, the Ni and the Ni–Pd alloy films acquire equilibrium fcc structure. The positive deviation from Vegard’s law takes place for dependence of solid solution lattice parameter on Pd content. As prepared Ni and Ni–Pd alloy films with hcp structure are characterized by lack of magnetic moment. The transition into ferromagnetic state occurs after annealing, and hysteresis is observed at magnetization reversal.