TY - JOUR

T1 - Peculiarities of Magnetic States of Iron-Cobalt Coatings Formed on Aluminum by Plasma Electrolytic Oxidation

AU - Kharitonskii, Petr

AU - Rudnev, Vladimir

AU - Sergienko, Elena

AU - Gareev, Kamil

AU - Tkachenko, Ivan

AU - Morozova, Vera

AU - Lukiyanchuk, Irina

AU - Adigamova, Maria

AU - Frolov, Anatoly

AU - Ustinov, Alexander

N1 - Funding Information: 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. Publisher Copyright: © 2017, Springer Science+Business Media, LLC, part of Springer Nature. Copyright: Copyright 2018 Elsevier B.V., All rights reserved.

PY - 2018/6/1

Y1 - 2018/6/1

N2 - 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 Hc = 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).

AB - 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 Hc = 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).

KW - Plasma electrolytic oxidation

KW - Fe-, Co-containing coatings

KW - Co-containing coatings

KW - Ferromagnetic properties

KW - Nanocrystallites

KW - Theoretical modeling

KW - Co-containing coatings

KW - Fe-, Co-containing coatings

KW - Ferromagnetic properties

KW - Nanocrystallites

KW - Plasma electrolytic oxidation

KW - Theoretical modeling

KW - CONTAINING OXIDE COATINGS

KW - ALLOY

KW - TITANIUM

KW - FE

KW - LAYERS

UR - http://www.scopus.com/inward/record.url?scp=85034654710&partnerID=8YFLogxK

UR - http://www.mendeley.com/research/peculiarities-magnetic-states-ironcobalt-coatings-formed-aluminum-plasma-electrolytic-oxidation

U2 - 10.1007/s10948-017-4423-8

DO - 10.1007/s10948-017-4423-8

M3 - Article

AN - SCOPUS:85034654710

VL - 31

SP - 1933

EP - 1940

JO - Journal of Superconductivity and Novel Magnetism

JF - Journal of Superconductivity and Novel Magnetism

SN - 1557-1939

IS - 6

ER -