Microelectrodeposition of Co-Pt alloys for micromagnetic applications

P. L. Cavallotti, M. Bestetti, S. Franz

Research output: Contribution to journalArticle

29 Citations (Scopus)

Abstract

Miniaturisation of advanced devices, such as sensors and micromotors, requires the development of micromagnets of small size but with a high magnetostatic energy. Cobalt alloys, and in particular cobalt-platinum alloys, are proposed for such applications, as well as for magnetic recording, due to their magnetic and corrosion resistance properties. Such alloys can be electrodeposited with good magnetic properties at high thickness by addition of phosphorus and other elements that favour a stable growth of the microstructure during deposition. Results on electrodeposition of Co-Pt-W(P) and Co-Pt-Zn(P) layers from sulphamate citrate solutions are presented. Thick deposits of high coercivity and layers with different preferred orientation are obtained by changing the operation conditions. The deposits have magnetic anisotropy, which favours their implementation in magnetic circuits where the field is perpendicular or parallel to the surface: in the former case, the magnetic easy direction of cobalt alloys must be perpendicular to the surface and in the latter, it must be parallel to the surface. The magnetic properties of Co-Pt-based alloys can be tailored to obtain the desired magnetic properties in relation to the application envisaged.

Original languageEnglish
Pages (from-to)3013-3020
Number of pages8
JournalElectrochimica Acta
Volume48
Issue number20-22
DOIs
Publication statusPublished - 30 Sep 2003
Externally publishedYes

Fingerprint

Cobalt alloys
Magnetic properties
Deposits
Platinum alloys
Micromotors
Magnetic circuits
Magnetostatics
Magnetic recording
Magnetic anisotropy
Coercive force
Electrodeposition
Citric Acid
Chemical elements
Phosphorus
Corrosion resistance
Microstructure
Sensors

Keywords

  • Co-Pt-W
  • Co-Pt-Zn
  • Cobalt-platinum alloys
  • Electrodeposition
  • Micromagnets

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Electrochemistry

Cite this

Microelectrodeposition of Co-Pt alloys for micromagnetic applications. / Cavallotti, P. L.; Bestetti, M.; Franz, S.

In: Electrochimica Acta, Vol. 48, No. 20-22, 30.09.2003, p. 3013-3020.

Research output: Contribution to journalArticle

Cavallotti, P. L. ; Bestetti, M. ; Franz, S. / Microelectrodeposition of Co-Pt alloys for micromagnetic applications. In: Electrochimica Acta. 2003 ; Vol. 48, No. 20-22. pp. 3013-3020.
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