Fabrication of CoNiMnP–BaFe₁₂O₁₉ nanocomposite coatings by electrodeposition

Abstract

There is an increasing interest in the preparation of magnetic composite coatings for application in microelectromechanical systems (MEMS) actuators. In this paper, the CoNiMnP–BaFe₁₂O₁₉ nanocomposite coatings have been electrodeposited from an aqueous bath containing BaFe₁₂O₁₉ nanoparticles. The influence of BaFe₁₂O₁₉ nanoparticles concentration in the bath on the incorporated nanoparticles fraction, element content fraction, surface morphology, preferred orientation, coercivity, retentivity, and the maximum energy density of the nanocomposite coatings has been investigated. The results indicate that the incorporation of BaFe₁₂O₁₉ nanoparticles favours the electrodeposition of Co and Mn while depressing the deposition of Ni and P. The maximum embedded BaFe₁₂O₁₉ nanoparticles fraction of ∼21·8 wt-% is achieved. The incorporation of BaFe₁₂O₁₉ nanoparticles may refine the grain size and change the preferred orientation within the nanocomposite coatings structure. CoNiMnP–BaFe₁₂O₁₉ nanocomposite coatings with maximum magnetic energy density of 17·68 kJ m⁻³ and maximum coercivity of 1342 Oe have been obtained.

Keywords:

• Magnetic composite coatings
• Electrodeposition
• CoNiMnP
• Barium ferrite particles
• Maximum magnetic energy density

The work described in this paper was supported by the Defense Science Foundation (grant no. 2520110001).