Exchange Coupling in MnAlC/α-Fe Nanocomposite Magnets
Nanostructured composite materials consisting of exchange-coupled hard and soft magnetic phases are proposed as alternative for the development of high-energy product permanent magnets. In this work, we have examined the effects of soft magnetic α-Fe addition on the structure and magnetic properties...
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Veröffentlicht in: | Journal of superconductivity and novel magnetism 2018-12, Vol.31 (12), p.3941-3947 |
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Hauptverfasser: | , , , , |
Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | Nanostructured composite materials consisting of exchange-coupled hard and soft magnetic phases are proposed as alternative for the development of high-energy product permanent magnets. In this work, we have examined the effects of soft magnetic α-Fe addition on the structure and magnetic properties of powders composed of hard magnetic Mn
54.3
Al
44
C
1.7
compound. The optimum melt-spun ribbon precursor (with
τ
-phase structure, with magnetization of 88 emu/g and coercive field of 1.6 kOe) was obtained after annealing the ribbons at 500
∘
C for 20 min. After the combination between the soft and the optimized hard phase, the intensity of
τ
-phase peaks measured by X-ray diffraction decreases. These changes can also be seen in the magnetic properties. The coercivity (∼ 500 Oe) tends to decrease with the annealing temperature, while the magnetization tends to increase up to 141 emu/g. Evidence of good exchange coupling between particles of Mn
54.3
Al
44
C
1.7
and α-Fe, in the produced composite, was proved by the hysteresis loop and its corresponding Thamm-Hesse analysis. |
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ISSN: | 1557-1939 1557-1947 |
DOI: | 10.1007/s10948-018-4661-4 |