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CoPt–Al2O3 Nanocomposite Films: Synthesis, Structure, and Magnetic Properties

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Abstract

The structure and magnetic properties of CoPt–Al2O3 nanocomposite films synthesized by the annealing of Al/(Co3O4 + Pt) bilayers on a MgO(001) substrate at 650°C in vacuum are investigated. The synthesized composite films contain ferromagnetic CoPt grains with an average size of 25–45 nm enclosed in a nonconducting Al2O3 matrix. The saturation magnetization (Ms ~ 330 G) and coercivity (Hc ≈ 6 kOe) of the films are measured in the film plane and perpendicular to it. The obtained films are characterized by a spatial rotational magnetic anisotropy, which makes it possible to arbitrarily set the easy magnetization axis in the film plane or perpendicular to it using a magnetic field stronger than the coercivity (H > Hc).

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ACKNOWLEDGMENTS

We thank D.A. Velikanov for measuring the hysteresis loops of the samples and G.N. Bondarenko for carrying out the X-ray structural experiments. Electron microscopy investigations of the sample surface and cross section were carried out using equipment of the Center of Collective Use of the Krasnoyarsk Scientific Center, Siberian Branch, Russian Academy of Sciences.

Funding

This study was supported by the Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Regional Fund of Science to the research projects no. 18-42-243009 r_mol_a and no. 19-43-240003 r_a, and the Foundation for Assistance to Small Innovative Enterprises in Science and Technology, contract no. 11843GU/2017, code 0033636, U.M.N.I.K. competition.

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Authors and Affiliations

  1. Kirensky Institute of Physics, Krasnoyarsk Scientific Center, Siberian Branch, Russian Academy of Sciences, 660036, Krasnoyarsk, Russia

    V. S. Zhigalov, L. E. Bykova, V. G. Myagkov, M. N. Volochaev, A. A. Matsynin & G. S. Patrin

  2. Siberian State University of Science and Technology, 660014, Krasnoyarsk, Russia

    A. N. Pavlova

  3. Siberian Federal University, 660041, Krasnoyarsk, Russia

    G. S. Patrin

Authors
  1. V. S. Zhigalov
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  2. L. E. Bykova
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  3. V. G. Myagkov
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  4. A. N. Pavlova
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  5. M. N. Volochaev
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  6. A. A. Matsynin
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  7. G. S. Patrin
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Correspondence to V. S. Zhigalov or L. E. Bykova.

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Translated by E. Bondareva

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Zhigalov, V.S., Bykova, L.E., Myagkov, V.G. et al. CoPt–Al2O3 Nanocomposite Films: Synthesis, Structure, and Magnetic Properties. J. Surf. Investig. 14, 47–53 (2020). https://doi.org/10.1134/S102745102001022X

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