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Coupled oscillations of electron and nuclear spins and spontaneous polarization in multiferroics: Specific features of NMR

  • Theory of Metals
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Abstract

Coupled oscillations of electron and nuclear spins and spontaneous polarization in films of multiferroics have been analyzed. The analysis has been performed on the example of antiferromagnetic films of BiFeO3 possessing weak ferromagnetism, magnetic anisotropy of the easy-plane type, and spontaneous polarization. The natural frequencies of the oscillations and the tensor of the high-frequency magnetoelectric susceptibility of the films (response to the ac magnetic and ac electric fields) have been calculated. Specific features of the susceptibility near the frequency of the nuclear magnetic resonance (NMR) have been investigated. The main dynamic characteristics of the system under consideration have been analyzed: the NMR frequencies, frequency shifts, enhancement coefficients. The possibility is discussed of the appearance of fundamentally new effects in these films in the region of NMR spectroscopy of magnets: (a) excitation of nuclear spins by an ac electric field with their subsequent detection with the use of the ac component of the magnetization (nuclear magnetoelectric resonance (NMER)); (b) excitation of the NMR signal by an ac magnetic field with its subsequent detection with the use of the ac component of the spontaneous polarization (nuclear electric-magnetic resonance (NEMR)).

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Authors and Affiliations

  1. Institute of Metal Physics, Ural Branch, Russian Academy of Sciences, ul. S. Kovalevskoi 18, Ekaterinburg, 620990, Russia

    A. P. Tankeyev, V. V. Smagin & M. A. Borich

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  1. A. P. Tankeyev
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  2. V. V. Smagin
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  3. M. A. Borich
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Original Russian Text © A.P. Tankeyev, V.V. Smagin, M.A. Borich, 2011, published in Fizika Metallov i Metallovedenie, 2011, Vol. 112, No. 4, pp. 339–350.

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Tankeyev, A.P., Smagin, V.V. & Borich, M.A. Coupled oscillations of electron and nuclear spins and spontaneous polarization in multiferroics: Specific features of NMR. Phys. Metals Metallogr. 112, 319–329 (2011). https://doi.org/10.1134/S0031918X11040272

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