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Unusual Behavior of the Coercive Field in a (CoFeB)x(LiNbOy)100 –x Nanocomposite with a High Content of Magnetic Ions in an Insulating Matrix

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

The temperature behavior of the coercive field Hc(T) and the magnetic anisotropy in (CoFeB)x(LiNbOy)100 –x nanocomposite films with a ferromagnetic alloy content x = 33–48 at % near the metal–insulator transition (xc ≈ 42 at %) have been studied by the magnetometry and ferromagnetic resonance methods. The films were ensembles of CoFe granules with lateral sizes of 2–4 nm, which are highly elongated (up to 10–15 nm) in the nanocomposite growth direction and embedded in a LiNbOy matrix with a high content of magnetic Fe2+ and Co2+ ions (up to 3 × 1022 cm–3). A nonmonotonic behavior of Hc(T), viz., a sharp minimum at a temperature TF ≈ 50 K close to the blocking temperature (\(T_{b}^{*}\) ≈ 70 K) of the granule magnetic moment, has been detected in samples with x < 42 at %. The effective field of the perpendicular growth anisotropy (0.4–0.8 kOe) turns out to be an order of magnitude lower than the field of the granule shape anisotropy (about 7 kOe) and increases with x. The revealed peculiarities are explained by the fact that, apart from the ferromagnetic intergranular exchange interaction in an infinite cluster, the surface anisotropy effects involving magnetic ions in a thin layer adjacent to the cluster and responsible for the surface interaction fluctuations play a big role in the investigated percolation nanocomposites, enhancing the nanocomposite demagnetization at T ≈ TF ~ \(T_{b}^{*}\).

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ACKNOWLEDGMENTS

This work was supported by the Federal Agency for Scientific Organizations (contract no. 007-03-2018-415) with regard to the “synthesis of (CoFeB)x(LiNbOy)100 –x films” and the Russian Foundation for Basic Research (project nos. 16-07-00657, 18-07-00772, 18-07-00756, 18-07-00729, 17-47-500273, 16-07-00798, 18-37-00267, 15-29-01171) with regard to the “investigation of magnetization and electrophysical properties of produced nanocomposite films.” The precision studies of coercitivity were supported by the National Research Center “Kurchatov Institute” (order no. 1713) using the equipment of the resource center of electrophysical methods.”

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Authors and Affiliations

  1. National Research Center “Kurchatov Institute”, pl. Akademika Kurchatova 1, 123182, Moscow, Russia

    V. V. Rylkov, A. N. Taldenkov, S. N. Nikolaev, A. V. Emelyanov, A. V. Sitnikov, K. Yu. Chernoglazov & V. A. Demin

  2. Kapitza Institute for Physical Problems, Russian Academy of Sciences, ul. Kosygina 2, 119334, Moscow, Russia

    A. B. Drovosekov

  3. Institute for Physics of Microstructures, Russian Academy of Sciences, Akademicheskaya ul. 7, 603950, Nizhny Novgorod, Russia

    O. G. Udalov

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

    A. V. Sitnikov

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

    V. V. Rylkov, A. S. Vedeneev & A. S. Bugaev

  6. Institute of Theoretical and Applied Electrodynamics, Russian Academy of Sciences, Izhorskaya ul. 13, 127412, Moscow, Russia

    V. V. Rylkov

  7. Institute for Problems of Laser and Information Technologies, Russian Academy of Sciences, Branch of Federal Research Center “Crystallography and Photonics”, 140700, Shatura, Moscow oblast, Russia

    O. A. Novodvorskii

  8. Moscow Institute of Physics and Technology, Institutskii per. 9, 141700, Dolgoprudnyi, Moscow oblast, Russia

    A. S. Bugaev

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  1. V. V. Rylkov
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  2. A. B. Drovosekov
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  3. A. N. Taldenkov
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  4. S. N. Nikolaev
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  5. O. G. Udalov
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  6. A. V. Emelyanov
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  7. A. V. Sitnikov
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  8. K. Yu. Chernoglazov
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  9. V. A. Demin
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  11. A. S. Vedeneev
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  12. A. S. Bugaev
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Corresponding authors

Correspondence to V. V. Rylkov or A. B. Drovosekov.

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Translated by V. Astakhov

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Rylkov, V.V., Drovosekov, A.B., Taldenkov, A.N. et al. Unusual Behavior of the Coercive Field in a (CoFeB)x(LiNbOy)100 –x Nanocomposite with a High Content of Magnetic Ions in an Insulating Matrix. J. Exp. Theor. Phys. 128, 115–124 (2019). https://doi.org/10.1134/S1063776119010163

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  • DOI: https://doi.org/10.1134/S1063776119010163

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