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Nuclear Magnetic Resonance and X-ray Reflectometry of Co/Cu Superlattices

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Abstract

The state of interfaces in Co/Cu superlattices with various thicknesses of non-magnetic Cu layers (tcu) has been studied by the methods of nuclear magnetic resonance (NMR) and X-ray reflectometry. The samples glass/Fe(5 nm)/[Co(1.5 nm)/Cu(tcu)]10/Cr(3 nm) were fabricated by the method of magnetron sputtering on glass substrates under constant current in the ULVAC MPS-4000-C6 device. The 59Co NMR spectra were taken in a local magnetic field in the frequency range of 90–240 MHz at 4.2 K in the pulsed NMR spectrometer. The spin echo signal was formed by a sequence of two coherent radio-frequency pulses (τp)x − tdel − (τp)y − tdel – echo forming an alternate magnetic field with the round component amplitude H1 of about 10 Oe in a resonance coil. It has been shown both by NMR and X-ray reflectometry that the structure of interfaces deteriorates with an increase of the Cu layers thickness, and similar dependences of the parameters characterizing structural imperfection of interfaces were obtained by these two methods.

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Acknowledgements

The work has been done within the State Program “Spin” (No AAAA-A18-118020290104-2) and the Program of Fundamental Research of the Ural Branch of the Russian Academy of Sciences (Project No. 18–10–2–37).

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Authors and Affiliations

  1. M.N. Miheev Institute of Metal Physics, Ural Branch of RAS, S. Kovalevskaya Str. 18, Yekaterinburg, 620108, Russia

    S. A. Chuprakov, N. S. Bannikova, I. V. Blinov, T. P. Krinitsina, M. A. Milyaev, V. V. Popov & V. V. Ustinov

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  1. S. A. Chuprakov
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  2. N. S. Bannikova
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  3. I. V. Blinov
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  4. T. P. Krinitsina
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  5. M. A. Milyaev
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  6. V. V. Popov
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  7. V. V. Ustinov
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Correspondence to S. A. Chuprakov.

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Chuprakov, S.A., Bannikova, N.S., Blinov, I.V. et al. Nuclear Magnetic Resonance and X-ray Reflectometry of Co/Cu Superlattices. Appl Magn Reson 50, 415–423 (2019). https://doi.org/10.1007/s00723-018-1090-2

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  • DOI: https://doi.org/10.1007/s00723-018-1090-2

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