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Title: Exchange Coupling in MnAlC/α-Fe Nanocomposite Magnets
Authors: Trujillo Hernández, Juan Sebastián
Maccari, Fernando
Marshall, Luke G.
Tabares, Jesús Anselmo
Alcázar Pérez, Germán Antonio
Issue Date: 28-Mar-2018
Publisher: Journal of Superconductivity and Novel Magnetism
Citation: Hernandez, J. S. T., Maccari, F., Marshall, L. G., Tabares, J. A., & Alcázar, G. A. P. (2018). Exchange coupling in MnAlC/α-fe nanocomposite magnets. Journal of Superconductivity and Novel Magnetism, , 1-7. doi:10.1007/s10948-018-4661-4
Abstract: 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 Mn54.3Al44C1.7 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 Mn54.3Al44C1.7 and α-Fe, in the produced composite, was proved by the hysteresis loop and its corresponding Thamm-Hesse analysis. © 2018 Springer Science+Business Media, LLC
ISSN: 1557-1939
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