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Global Journal of Physical Chemistry. Volume 2, Issue 2 (2011) pp. 56-60
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Research Article
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Free Article
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Structural and magnetic properties of the mechanically alloyed FeCo-based mixtures
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S. Allega, S. Azzazaa, J.J. Suñolb
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a Laboratoire de Magnétisme et de Spectroscopie des Solides (LM2S) Département de Physique,
Université Badji-Mokhtar-Annaba B.P. 12, Annaba 23000, Algérie
b Département de Fisica, Universitat de Girona, Campus de Montillivi, Girona 17071, Spain
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Abstract |
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Structural and magnetic properties of the mechanically alloyed Fe50Co50 and (Fe50Co50)62Nb8B30 powder mixtures were studied by X-ray diffraction and vibrating sample magnetometry. For the Fe50Co50 powders, a bcc a-Fe(Co) solid solution with a lattice parameter close to 0.2861 nm is achieved after 24 h of milling. The magnetization increases gradually with milling time and saturates after 24 h (Ms = 215 emu/g). The soft magnetic properties (low values of coercivity, Hc, and squarness ratio Mr/Ms) point out that small magnetic particles are typically single domain. Nevertheless, for the (Fe50Co50)62Nb8B30 powders, a nanocomposite structure is achieved after 125 h of milling. The saturation magnetization decreases rapidly during the first hours of milling to about 15.24 emu/g and remains nearly constant on further milling. The coercivity, Hc, value is about 160 Oe.
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Keywords |
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Nanostructured materials; FeCo-based alloys; Mechanical alloying; X-ray diffraction; Coercivity; Saturation magnetization
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