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Magnetic properties and spin dynamics of CoFeB–SiO2 multilayer granular heterostructures

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Abstract

It has been found that CoFeB–SiO2/C and CoFeB–SiO2/Bi2Te3 multilayer heterostructures with a cluster structure of CoFeB layers feature a long-range magnetic order in the entire temperature range from 2 to 300 K. At high temperatures (T = 300 K), CoFeB clusters exhibit magnetic properties characteristic of superparamagnets. At low temperatures (T = 5 K), clusters are ferromagnetic, and the easy magnetization axis is in the film plane. The temperature of the ferromagnetic-to-superparamagnetic state transition of clusters depends on a dielectric interlayer material: the use of Bi2Te3 instead of C as a spacer layer leads to an increase in the transition temperature by a factor of 4 and an increase in the magnetization blocking temperature of CoFeB clusters in a field of 100 Oe by a factor of 3.

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Authors and Affiliations

  1. All-Russia Scientific Research Institute of Aviation Materials, ul. Radio 17, Moscow, 105005, Russia

    E. N. Kablov, O. G. Ospennikova, V. P. Piskorskii, D. V. Korolev & R. B. Morgunov

  2. Voronezh State Technical University, Moskovskii pr. 14, Voronezh, 394026, Russia

    Yu. E. Kalinin & A. V. Sitnikov

  3. Institute of Problems of Chemical Physics, Russian Academy of Sciences, ul. Akademika Semenova 1, Moscow oblast, Chernogolovka, 142432, Russia

    E. I. Kunitsyna, A. D. Talantsev & R. B. Morgunov

  4. Orenburg State University, pr. Pobedy 13, Orenburg, 460018, Russia

    V. L. Berdinskii

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  1. E. N. Kablov
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  2. O. G. Ospennikova
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  3. V. P. Piskorskii
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  4. D. V. Korolev
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  5. Yu. E. Kalinin
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  6. A. V. Sitnikov
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  7. E. I. Kunitsyna
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  8. A. D. Talantsev
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  9. V. L. Berdinskii
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  10. R. B. Morgunov
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Corresponding author

Correspondence to R. B. Morgunov.

Additional information

Original Russian Text © E.N. Kablov, O.G. Ospennikova, V.P. Piskorskii, D.V. Korolev, Yu.E. Kalinin, A.V. Sitnikov, E.I. Kunitsyna, A.D. Talantsev, V.L. Berdinskii, R.B. Morgunov, 2016, published in Fizika Tverdogo Tela, 2016, Vol. 58, No. 6, pp. 1086–1092.

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Kablov, E.N., Ospennikova, O.G., Piskorskii, V.P. et al. Magnetic properties and spin dynamics of CoFeB–SiO2 multilayer granular heterostructures. Phys. Solid State 58, 1121–1127 (2016). https://doi.org/10.1134/S1063783416060196

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  • DOI: https://doi.org/10.1134/S1063783416060196

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