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Magnetoresistance of a Ferromagnet/Superconductor/Ferromagnet Trilayer Microbridge Based on Diluted PdFe Alloy

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Abstract

A negative magnetoresistive effect has been observed for ferromagnet/superconductor/ferromagnet (FSF) microbridges based on diluted ferromagnetic PdFe alloy containing as small as 1% of magnetic atoms. The effect is represented by sharp negative peaks in magnetoresistance at magnetic fields opposite in sign to the initial saturated magnetizations. Microstructuring of the FSF trilayers does not suppress the effect: the most pronounced dips were obtained for the smallest bridges 6–8 µm wide and 10–15 µm long. The negative magnetoresistance peak was observed at temperatures within the superconducting transition and reaches a noticeable value of up to 1.3% of the normal state resistance.

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Acknowledgments

We are grateful to N.S. Stepakov, V.N. Shilov, and N.S. Shuravin for their assistance in doing experiments and manuscript preparation.

Funding

L.N. Karelina and V.V. Ryazanov acknowledge the support of the Russian Foundation for Basic Research, project no. 19-32-90162. I.A. Golovchanskiy and V.I. Chichkov took part in technological work and discussion of the results within the framework of NUST MISIS State Assignment no. 0718-2020-0025.

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Authors and Affiliations

  1. Institute of Solid State Physics, Russian Academy of Sciences, Chernogolovka, Moscow region, 142432, Russia

    L. N. Karelina, V. V. Bolginov, Sh. A. Erkenov, S. V. Egorov & V. V. Ryazanov

  2. Moscow Institute of Physics and Technology, National Research University, Dolgoprudnyi, Moscow region, 141700, Russia

    Sh. A. Erkenov, I. A. Golovchanskiy & V. V. Ryazanov

  3. Russian National University of Science and Technology (NUST) MISiS, Moscow, 119049, Russia

    I. A. Golovchanskiy, V. I. Chichkov, A. Ben Hamida & V. V. Ryazanov

  4. Leiden Institute of Physics, Leiden University, 2333 CA, Leiden, The Netherlands

    A. Ben Hamida

Authors
  1. L. N. Karelina
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  2. V. V. Bolginov
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  3. Sh. A. Erkenov
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  4. S. V. Egorov
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  5. I. A. Golovchanskiy
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  6. V. I. Chichkov
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  7. A. Ben Hamida
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  8. V. V. Ryazanov
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Corresponding author

Correspondence to L. N. Karelina.

Additional information

Published in Russian in Pis’ma v Zhurnal Eksperimental’noi i Teoreticheskoi Fiziki, 2020, Vol. 112, No. 11, pp. 743–748.

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Karelina, L.N., Bolginov, V.V., Erkenov, S.A. et al. Magnetoresistance of a Ferromagnet/Superconductor/Ferromagnet Trilayer Microbridge Based on Diluted PdFe Alloy. Jetp Lett. 112, 705–709 (2020). https://doi.org/10.1134/S0021364020230010

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  • DOI: https://doi.org/10.1134/S0021364020230010

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