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Temperature Evolution of Magnetic Resonance Spectra in Metal–Insulator Nanogranular Composites with Paramagnetic Ions in an Insulating Matrix

  • ORDER, DISORDER, AND PHASE TRANSITION IN CONDENSED SYSTEM
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Abstract

Films of metal–insulator nanogranular (CoFeB)x(LiNbO3)100 – x and (CoFeB)x(Al2O3)100 – x composites with different content x of a ferromagnetic metallic phase have been investigated by the magnetic resonance method in a wide temperature range (4.2–360 K). The systems under study are characterized by a high concentration of paramagnetic Fe and Co ions, which are dispersed in the insulating medium between ferromagnetic CoFeB granules. The experimental spectra of these systems show a peak of ferromagnetic resonance associated with the ferromagnetic granule array and an additional less intense absorption peak associated with the electron paramagnetic resonance of Fe3+ ions in the insulating matrix. It has been found that the position and intensity of this peak depend on the composition of the system and temperature. The observed behavior is explained by existence of exchange interaction between magnetic ions and ferromagnetic granules.

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Funding

The work was carried out within the framework of a state assignment and was financially supported by the Russian Science Foundation (project no. 22-29-00392) in part of studying the magnetic resonance and electrophysical properties of nanocomposite samples. The synthesis of nanocomposite films was supported by the Russian Foundation for Basic Research (project no. 19-29-03022).

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Authors and Affiliations

  1. P.L. Kapitza Institute for Physical Problems, Russian Academy of Sciences, 119334, Moscow, Russia

    A. B. Drovosekov, N. M. Kreines & O. A. Kovalev

  2. National Research University Higher School of Economics, 101000, Moscow, Russia

    O. A. Kovalev

  3. Voronezh State Technical University, 394026, Voronezh, Russia

    A. V. Sitnikov

  4. National Research Center Kurchatov Institute, 123182, Moscow, Russia

    A. V. Sitnikov, S. N. Nikolaev & V. V. Rylkov

  5. Kotel’nikov Institute of Radio Engineering and Electronics, Fryazino Branch, Russian Academy of Sciences, 141190, Fryazino, Moscow oblast, Russia

    V. V. Rylkov

Authors
  1. A. B. Drovosekov
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  2. N. M. Kreines
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  3. O. A. Kovalev
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  4. A. V. Sitnikov
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  5. S. N. Nikolaev
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  6. V. V. Rylkov
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Corresponding author

Correspondence to A. B. Drovosekov.

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Translated by V. Isaakyan

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Drovosekov, A.B., Kreines, N.M., Kovalev, O.A. et al. Temperature Evolution of Magnetic Resonance Spectra in Metal–Insulator Nanogranular Composites with Paramagnetic Ions in an Insulating Matrix. J. Exp. Theor. Phys. 135, 372–376 (2022). https://doi.org/10.1134/S1063776122090047

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  • DOI: https://doi.org/10.1134/S1063776122090047

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