Effect of the Applied Current Density on the Structural and Magnetic Properties of the Electrodeposited Cobalt-Nickel Alloy Thin Films

Abstract

In this study, cobalt-nickel (Co-Ni) alloys were deposited electrochemically onto aluminum substrates under applied current densities of 103.8, 138.4, 173 and 207.6 A m −2 . Influence of the applied current density on the structural and magnetic properties of the Co-Ni alloys was investigated. The bath for Co-Ni alloys deposition was composed of 0.08 mol l −1 CoSO4·7H2O, 0.2 mol l −1 NiCl2·6H2O, 0.1 mol l −1 NiSO4·6H2O and 0.25 mol l −1 H3BO3. The electrochemical investigation of Co-Ni alloys was completed using cyclic voltammetry and galvanostatic studies. Inductively coupled plasma analysis has shown that the amount of the cobalt in the deposited alloy has decreased from 73.61% to 67.01% with the increase of the applied current density from 103.8 to 207.6 A m −2 . According to the magnetic analysis results, the values of coercivity coefficient of the deposited Co-Ni alloys range between 115 and 150 Oe, confirming ferromagnetic behavior of the alloys. Experiment results indicate that magnetic and structural properties of the Co-Ni alloy deposits are greatly influenced by the applied current density in the electrodeposition system.

Effect of Laminated Structure on Mechanical Properties of Composition-modulated Co–Ni Laminated Plating

“…4,5) This composition-modulated Co-Ni laminated plating is available to produce by periodically varying stirring conditions during film formation in a single bath. Many of the studies [6][7][8][9][10][11][12] have been reported on the plating films consisted of the conventional metal multilayer films, but laminated structure producing required lamination in the plural different tanks or pulse electric plating as well as due to complicated manufacturing process, so that they are difficult to be put into industrial practice. In addition, there are many studies on the thickness of the constituent layers at the nanometer level, but there are few reports on thick films laminated with micrometer-level layers.…”

Elektrodepolama ile Üretilen Co, Ni ve CoNi Alaşımlı İnce Filmlerin Yapısal ve Manyetik Özelliklerinin İncelenmesi

“…Cobalt-nickel (CoNi) alloys are high quality engineering materials having high strength, good wear resistance, corrosion resistance, hardness, nuclear power systems, thermal conductivity, electrocatalytic and magnetic properties [1][2][3][4]. It is known that CoNi alloys have excellent magnetic properties and also, they are superior to pure metals [5].…”