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Origin of the magneto—thermogalvanic voltage in cluster-assembled metallic nanostructures

Nature Materials volume 7, page 257 (2008)Cite this article

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In their September 2006 article in Nature Materials, Serrano-Guisan et al. describe magneto-transport and thermoelectric measurements of magnetic nanoparticles in a metallic matrix1 that exhibit giant magneto-resistance2,3 (GMR). In such systems the resistance is lowest in large magnetic fields when the magnetic particles are aligned. As the applied field is reduced, the magnetization directions of the particles become random due to local variations in the anisotropy, interactions and thermal fluctuations, resulting in increases in the resistance2,3. For small, low-anisotropy particles, the dominant process for randomizing is thermal activation known as superparamagnetism.

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Figure 1: The calculated magneto-thermal transport response assuming a collection of independent superparamagnetic particles of moment m in a metallic matrix.

References

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Authors and Affiliations

  1. Department of Electrical and Computer Engineering and Center for Magnetic Recording Research, University of California, San Diego, La Jolla, 92093, California, USA

    Eric E. Fullerton

  2. Laboratoire de Physique des Matériaux, Nancy-Université, CNRS, Boîte Postal 239, Vandoeuvre les Nancy, F-54506, France

    Stéphane Mangin

Authors
  1. Eric E. Fullerton
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  2. Stéphane Mangin
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Fullerton, E., Mangin, S. Origin of the magneto—thermogalvanic voltage in cluster-assembled metallic nanostructures. Nature Mater 7, 257 (2008). https://doi.org/10.1038/nmat2153a

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