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Size effects of the magnetic anisotropy of fcc cobalt nanoparticles embedded in copper

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Abstract

Cobalt nanoparticles embedded in copper matrices show strong size effects in the magnetic anisotropy with a non-monotonous dependence on the particle diameter. In this article we discuss quantitative values of the magnetic anisotropy in the frame of two models: in small clusters the surface anisotropy contribution dominates whereas larger particles ( >3 nm diameter) have an elliptic shape leading to increased shape anisotropy. The crystalline structure of the particles is shown to be face-centered cubic, justifying that the magneto-crystalline anisotropy can be neglected.

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Authors and Affiliations

  1. Univ. Lyon, Université Claude Bernard Lyon 1, CNRS, Institut Lumière Matière, 69622, Villeurbanne, France

    Matthias Hillenkamp, Simón Oyarzún, Nicolas Troc, Julien Ramade, Alexandre Tamion, Florent Tournus & Véronique Dupuis

  2. Univ. Estadual Campinas Unicamp, Inst. Fis. Gleb Wataghin, Rua Sergio Buarque de Holanda 777, 13083859, Campinas, SP, Brazil

    Matthias Hillenkamp & Varlei Rodrigues

Authors
  1. Matthias Hillenkamp
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  2. Simón Oyarzún
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  3. Nicolas Troc
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  4. Julien Ramade
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  5. Alexandre Tamion
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  6. Florent Tournus
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  7. Véronique Dupuis
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  8. Varlei Rodrigues
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Correspondence to Matthias Hillenkamp.

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Hillenkamp, M., Oyarzún, S., Troc, N. et al. Size effects of the magnetic anisotropy of fcc cobalt nanoparticles embedded in copper. Eur. Phys. J. D 71, 330 (2017). https://doi.org/10.1140/epjd/e2017-80299-x

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