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Enhancement of the magnetoresistive effect in nanocomposites based on manganite La0.67Sr0.33MnO3 and magnetite Fe3O4

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Abstract

The effect of a magnetite Fe3O4 nanopowder in a nanocomposite with manganite La0.67Sr0.33MnO3 on its magnetoresistive effect and conductivity is studied. The addition of a magnetite nanopowder to the initial material leads to a substantial (twofold) increase in the low-field magnetoresistive effect. The low-field magnetoresistive effect in substituted lanthanum manganite nanopowders is based on spin-dependent electron tunneling through grain boundaries. The transport mechanisms in such systems are analyzed, and noise spectroscopy is also used for this purpose.

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Authors and Affiliations

  1. Shevchenko National University, ul. Glushkova 6, Kiev, 01033, Ukraine

    S. A. Pud, V. F. Kovalenko & M. V. Petrichuk

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  1. S. A. Pud
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  2. V. F. Kovalenko
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  3. M. V. Petrichuk
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Correspondence to S. A. Pud.

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Original Russian Text © S.A. Pud, V.F. Kovalenko, M.V. Petrichuk, 2010, published in Zhurnal Tekhnicheskoĭ Fiziki, 2010, Vol. 80, No. 4, pp. 89–93.

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Pud, S.A., Kovalenko, V.F. & Petrichuk, M.V. Enhancement of the magnetoresistive effect in nanocomposites based on manganite La0.67Sr0.33MnO3 and magnetite Fe3O4 . Tech. Phys. 55, 521–525 (2010). https://doi.org/10.1134/S1063784210040158

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  • DOI: https://doi.org/10.1134/S1063784210040158

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