Fe-Pd Ferromagnetic Shape Memory Alloy Thin Films Made By Dual Source DC Magnetron Sputtering

Abstract

Fe-Pd films have been deposited onto fused quartz substrates using a dual source dc magnetron sputtering apparatus, equipped with two independent targets of pure Fe and Pd. The Pd content of deposited films can be controlled with an accuracy of 1 at%Pd by varying the power for the Pd target at constant power for the Fe target. Fe-Pd films containing about 29 at%Pd show a fct structure after annealing at 900 C followed by quenching into iced water. These films underwent a thermoelastic fcc-to-fct martensitic transformation and the fct-phase region, where the fct phase is present at room temperature in the annealed films, has a tendency of shifting toward higher Pd content with increasing film thickness. This thickness effect is attributed to the difference in internal stress created during annealing. The martensite start temperature (M s ) of films containing 28.5-30.0 at%Pd was higher than room temperature, and it became lower with increasing Pd content. When Fe-30 at%Pd films were separated from the quartz substrate, they showed shape memory behavior upon heating after deformation.

Electrochemical syntheses of soft and hard magnetic Fe50Pd50-based nanotubes and their magnetic characterization

“…[1]. On the other hand, there are only a few reports on the electrodeposition of Fe-Pd; this is due to the difficulty in preparing a stable electrolyte.…”

Magnetic properties of Fe–∼30 at% Pd films

“…So far, only few papers [1][2][3] have been published dealing with properties of Fe-Pd films with similar composition and structure. Inoue et al [1][2] reports on structure and the shape memory characteristics of Fe-Pd films with a thickness from 0.3 to 4 mm and a composition from about 25 to 32 at% Pd.…”

Synthesis of iron–palladium binary alloy nanotubes by template-assisted electrodeposition from metal-complex solution

“…Particularly note that there is observed a strong interdependence between magnetic properties and the degree of long-range chemical ordering. Therefore, synthesis and characterization of Fe-Pd alloys with versatile morphologies, nanostructures and composition ratios are significant research subjects [20][21][22]. We have previously succeeded in preparing the Fe-Pd thin films with shape memory effect by an electrodeposition process from a plating bath containing ammonium tartrate, citric acid and ammonia solution as complexing agents [20], to overcome the difficulty in preparing stable and effective electroplating baths.…”