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Effect of alloy formation processes in the Co-Cu system on the magnetic and magnetoresistance properties of multilayer Co/Cu films with ultrathin Co layers prepared by DC magnetron sputtering

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Abstract

This paper reports on a study of multilayer Co/Cu films with an effective thickness of the Co layer of ∼3.5 Å, which were prepared by magnetron sputtering. The samples prepared have been found to have a metastable multiphase structure. An analysis of the data obtained by structural and, primarily, by magnetic methods has revealed that the main phases are the Co/Cu supersaturated solid solution (alloy) with a Co concentration of about 30 at %, the superparamagnetic phase, and the paramagnetic phase, which is accounted for by the presence of small (a few atoms at most) Co clusters embedded in the Cu matrix. A clearly pronounced maximum in the temperature dependences of the low-field magnetoresistance has been found, which is associated with the temperature of the magnetic phase transition of the supersaturated Co-Cu alloy.

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Authors and Affiliations

  1. Siberian Federal University, pr. Svobodny 79, Krasnoyarsk, 660041, Russia

    D. L. Khalyapin

  2. Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Akademgorodok 50, Krasnoyarsk, 660036, Russia

    D. L. Khalyapin, P. D. Kim, I. A. Turpanov, A. Ya. Beten’kova, G. V. Bondarenko & T. N. Isaeva

  3. Department of Metallurgical and Material Science, Hanyang University, Sa-3-dong 1271, Ansan, 426-791, Korea

    J. Kim

  4. EMD Laboratory, Central R&D Institute, Samsung Electro-Mechanics Co., LTD, 314 Maetan3-Dong, Yeongtong-Gu, Suwon, Gyunggi-Do, 443-743, Korea

    I. Kim

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  1. D. L. Khalyapin
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  2. P. D. Kim
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Correspondence to D. L. Khalyapin.

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Original Russian Text © D.L. Khalyapin, P.D. Kim, J. Kim, I.A. Turpanov, A.Ya. Beten’kova, G.V. Bondarenko, T.N. Isaeva, I. Kim, 2010, published in Fizika Tverdogo Tela, 2010, Vol. 52, No. 9, pp. 1665–1674.

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Khalyapin, D.L., Kim, P.D., Kim, J. et al. Effect of alloy formation processes in the Co-Cu system on the magnetic and magnetoresistance properties of multilayer Co/Cu films with ultrathin Co layers prepared by DC magnetron sputtering. Phys. Solid State 52, 1787–1796 (2010). https://doi.org/10.1134/S1063783410090015

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