Weakly interacting ultra-fine Fe nanoparticles embedded in Yb metallic matrix

C. Rojas-Ayala, E. C. Passamani, F. J. Litterst, E. M. Baggio-Saitovitch

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Magnetic interactions in iron nanoparticles embedded in an ytterbium metallic matrix have been systematically studied using several DC magnetic protocols (zero-field cooling ZFC and field-cooling FC). A transition from a superparamagnetic to a magnetically blocked regime was observed at 4.4 K associated with ultrafine (~1.8 nm3) iron particles. These iron nanoparticles have shown an enhanced effective anisotropy, Keff = 8.1(5) × 105 J m−3, however, no spin canting at their surfaces was observed, as suggested by the absence of exchange bias effect measured under FC protocol. Different magnetization experiments (temperature dependence of the thermo-remnant moment difference, ZFC-FC magnetic aging/memory protocols, Arrott plots) and phenomenological models applied to the magnetization data have shown that the iron nanoparticles have a narrow size distribution. Likewise, our results show that the ultra-fine iron nanoparticles are weakly interacting via the metallic ytterbium matrix by a magnetic exchange mechanism. This magnetic interaction leads the ensemble of iron nanoparticles to a cluster-glass-like state for temperatures below 5 K.

Original languageEnglish
Article number167654
JournalJournal of Magnetism and Magnetic Materials
StatePublished - 1 May 2021
Externally publishedYes

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© 2020 Elsevier B.V.


  • DC protocols
  • Ultra-fine Fe nanoparticles
  • Weak inter-particle interactions
  • Yb matrix


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