Strain effect in film materials NiXFe1–X/S

Abstract The results of experimental investigations of the strain properties of film alloys based on Ni and Fe with longitudinal strain in the intervals Δe l 1 = (0–1)%, Δe l 2 = (0–2)% and Δe l 3 = (0–3)%. It is established that films exhibit nonlinearity on the dependence of the differential coefficient of longitudinal strain coefficient γ ldif versus strain, which is characterized by a local maximum at the magnitude of strain e ltr . An additional analysis indicates that the appearance of a maximum can be explained by the realization of the nonlinear dependence of the resistance versus strain, that is, the transition from elastic to quasi-elastic or from elastic to plastic. The experimental dependences of e ltr and γ lint on the thickness and Fe atoms concentration in the film alloy are obtained. If in the case of e ltr the expected size dependence is observed, in the case of γ lint an abnormal effect (an increase γ lint with a thickness increase) occurs, which is takes place in film alloys. The reason for such anomalies in comparison with one-component films can be explained by different contributions of the surface (Fuch) and grain-boundary (Mayadas-Shatzkes) of the electron scattering in value γ lint in film alloys at the quasi-elastic or plastic strain.