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Large positive magnetoresistance effect in metal-insulator nanocomposites in weak magnetic fields

  • Magnetism and Ferroelectricity
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Abstract

Studies of the magnetoresistance of granular Fe/SiO2 films within the compositional range corresponding to insulators revealed a large positive magnetoresistance. The positive magnetoresistance reaches 10% in magnetic fields ∼100 Oe at room temperature and exhibits slow response times (∼2 min) to stepped magnetic-field variation. The nature of the effect is apparently associated with the influence of ferromagnetic cluster aggregates of iron nanoparticles on the magnetoresistance.

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Authors and Affiliations

  1. Russian Research Center Kurchatov Institute, pl. Kurchatova 1, Moscow, 123182, Russia

    A. E. Varfolomeev

  2. Institute of Problems in Applied Electrodynamics, Russian Academy of Sciences, ul. Izhorskaya 13/19, Moscow, 127412, Russia

    M. V. Sedova

Authors
  1. A. E. Varfolomeev
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  2. M. V. Sedova
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__________

Translated from Fizika Tverdogo Tela, Vol. 45, No. 3, 2003, pp. 500–504.

Original Russian Text Copyright © 2003 by Varfolomeev, Sedova.

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Varfolomeev, A.E., Sedova, M.V. Large positive magnetoresistance effect in metal-insulator nanocomposites in weak magnetic fields. Phys. Solid State 45, 529–533 (2003). https://doi.org/10.1134/1.1562242

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  • DOI: https://doi.org/10.1134/1.1562242

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