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Peculiarities of Magnetic States of Iron-Cobalt Coatings Formed on Aluminum by Plasma Electrolytic Oxidation

  • Petr Kharitonskii
  • Vladimir Rudnev
  • Elena Sergienko
  • Kamil Gareev
  • Ivan Tkachenko
  • Vera Morozova
  • Irina Lukiyanchuk
  • Maria Adigamova
  • Anatoly Frolov
  • Alexander Ustinov
Original Paper

Abstract

Ferromagnetic oxide coatings were formed on aluminum alloy by the plasma-electrolytic oxidation technique in an electrolyte with colloidal particles of iron and cobalt hydroxides. Iron and cobalt are concentrated in the coating pores as a part of nanosized crystallites. The size of individual crystallites in the pores was ∼50–100 nm. The deficit of oxygen to form oxides in crystallites shows that the metals in the crystallites are predominantly in a reduced state. It is also possible that the metal or oxide nuclei are surrounded by oxide-hydroxide shells. The coatings obtained within 5 min have a high coercive force H c = 1300 Oe. A theoretical analysis of the magnetic properties of Fe-, Co-containing coatings has been performed using the model of clusters consisting of magnetostatically interacting particles. The theoretical value of the saturation magnetization and the experimental values of the coercive force can be explained with the presence of two phases in the nanoparticles: a large antiferromagnetic or ferromagnetic (hydroxides and/or oxides of iron and cobalt) and a small superparamagnetic (iron, cobalt, magnetite, maghemite).

Keywords

Plasma electrolytic oxidation Fe-, Co-containing coatings Co-containing coatings Ferromagnetic properties Nanocrystallites Theoretical modeling 

Notes

Acknowledgments

The work was carried out within Russian State Theme No. 265-2014-001 and partially supported by grants of the Program “Far East” and the Russian Foundation for Basic Research No. 15-03-03271.

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2017

Authors and Affiliations

  • Petr Kharitonskii
    • 1
    • 4
  • Vladimir Rudnev
    • 2
    • 3
  • Elena Sergienko
    • 1
  • Kamil Gareev
    • 4
  • Ivan Tkachenko
    • 2
  • Vera Morozova
    • 2
  • Irina Lukiyanchuk
    • 2
  • Maria Adigamova
    • 2
  • Anatoly Frolov
    • 3
  • Alexander Ustinov
    • 2
    • 3
  1. 1.Saint-Petersburg State UniversitySaint PetersburgRussia
  2. 2.Institute of Chemistry, Far Eastern BranchRussian Academy of SciencesVladivostokRussia
  3. 3.Far Eastern Federal UniversityVladivostokRussia
  4. 4.Saint-Petersburg Electrotechnical University “LETI”Saint PetersburgRussia

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