The influence of pH and bath composition on the properties of Fe-Co alloy film electrodeposition

Fe-Co films were electrodeposited on ITO glass substrates from the electrolytes with different molar ratio of Co²⁺/Fe²⁺ and different pH values (2.1, 2.9, 3.7, and 4.3) at 25 °C. The properties of Fe-Co alloy films depend on both Co²⁺ and Fe²⁺ concentrations in electrolyte and pH values was studied. The content of Co increases from 40% to 85% as the mole ratio of CoSO₄/FeSO₄ increasing from 0.50/0.50 to 0.90/0.10 in electrolyte and slightly decreases from 77% to 63% as the pH values increasing from 2.1 to 4.3. The X-ray diffraction analysis reveals that the structures of the films strongly depend on the Co content in the binary films. The surface morphologies of the films are influenced by the combined action of composition and phase structure. The saturation magnetization reaches a maximum value of 2974.03 emu/cm³ and coercivity reaches a minimum value of 42.72 Oe of the Fe_0.30Co_0.70. The saturation magnetization reaches a maximum values of 2974.03 emu/cm³ and coercivity reaches a minimum values of 42.72 Oe of the Fe_0.30Co_0.70 at pH = 2.9.