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Enhanced nucleation fields due to dipolar interactions in nanocomposite magnets

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Abstract

One approach to construct powerful permanent magnets while using less rare-earth elements is to combine a hard magnetic material having a high coercive field with a soft magnetic material having a high saturation magnetization at the nanometer scale and create so-called nanocomposite magnets. If both materials are strongly coupled, exchange forces will form a stable magnet. We use finite element micromagnetics simulations to investigate the changing hysteresis properties for varying arrays of soft magnetic spherical inclusions in a hard magnetic body. We show that the anisotropy arising from dipolar interactions between soft magnetic particles in a hard magnetic matrix can enhance the nucleation field by more than 10% and strongly depends on the arrangement of the inclusions.

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Authors and Affiliations

  1. St. Poelten University of Applied Sciences, Matthias Corvinus-Strasse 15, 3100, St. Poelten, Austria

    Johann Fischbacher, Simon Bance, Lukas Exl, Markus Gusenbauer, Harald Oezelt, Franz Reichel & Thomas Schrefl

Authors
  1. Johann Fischbacher
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  2. Simon Bance
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  3. Lukas Exl
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  4. Markus Gusenbauer
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  5. Harald Oezelt
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  6. Franz Reichel
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  7. Thomas Schrefl
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Corresponding author

Correspondence to Johann Fischbacher.

Additional information

Contribution to the Topical Issue “New Trends in Magnetism and Magnetic Materials”, edited by Francesca Casoli, Massimo Solzi and Paola Tiberto.

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Fischbacher, J., Bance, S., Exl, L. et al. Enhanced nucleation fields due to dipolar interactions in nanocomposite magnets. Eur. Phys. J. B 86, 100 (2013). https://doi.org/10.1140/epjb/e2013-30938-1

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  • DOI: https://doi.org/10.1140/epjb/e2013-30938-1

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