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Silva NJ, Amaral JS, Amaral VS, et al. Superferromagnetism in mechanically alloyed fcc Fe(23)Cu(77) with bimodal cluster size distribution. J Phys Condens Matter. 2008;21(4):046003doi: 10.1088/0953-8984/21/4/046003.
Silva, N. J., Amaral, J. S., Amaral, V. S., Costa, B. F., & Le Caër, G. (2009). Superferromagnetism in mechanically alloyed fcc Fe(23)Cu(77) with bimodal cluster size distribution. Journal of physics. Condensed matter : an Institute of Physics journal, 21(4), 046003. https://doi.org/10.1088/0953-8984/21/4/046003
Silva, N J O, et al. "Superferromagnetism in mechanically alloyed fcc Fe(23)Cu(77) with bimodal cluster size distribution." Journal of physics. Condensed matter : an Institute of Physics journal vol. 21,4 (2009): 046003. doi: https://doi.org/10.1088/0953-8984/21/4/046003
Silva NJ, Amaral JS, Amaral VS, Costa BF, Le Caër G. Superferromagnetism in mechanically alloyed fcc Fe(23)Cu(77) with bimodal cluster size distribution. J Phys Condens Matter. 2009 Jan 28;21(4):046003. doi: 10.1088/0953-8984/21/4/046003. Epub 2008 Dec 22. PMID: 21715830.
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J Phys Condens Matter. 2009 Jan 28;21(4):046003. doi: 10.1088/0953-8984/21/4/046003. Epub 2008 Dec 22.

Superferromagnetism in mechanically alloyed fcc Fe(23)Cu(77) with bimodal cluster size distribution.

Journal of physics. Condensed matter : an Institute of Physics journal

N J O Silva, J S Amaral, V S Amaral, B F O Costa, G Le Caër

Affiliations

  1. Departamento de Física and CICECO, Universidade de Aveiro, 3810-193 Aveiro, Portugal.

PMID: 21715830 DOI: 10.1088/0953-8984/21/4/046003

Abstract

Magnetic measurements, x-ray diffraction and Mössbauer spectroscopy were used to characterize a nanostructured fcc Fe(23)Cu(77) at.% alloy prepared by high-energy ball-milling, addressing in particular the effect of clustering on the nature of the interacting magnetic entities. The interpretation of magnetization measurements leads to the conclusion that grains, whose mean size is ∼16 nm, contain two populations of magnetic Fe-rich nanoclusters with a bimodal size distribution. These two sets of clusters contain about 14 and 400 Fe atoms and have magnetic moments of 30 µ(B) and 860 µ(B), respectively. The inter-cluster ferromagnetic interactions that lead to superferromagnetism with a Curie temperature T(C)∼220 K can be described by a mean field determined by the smaller clusters only, which account for 90% of the magnetization.

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