Effect of ball milling and thermal treatment on exchange bias and magnetocaloric properties of Ni 48 Mn 39.5 Sn 10.5 Al 2 ribbons
| Autor: | Artur Chrobak, Wojciech Maziarz, Janusz Przewoźnik, Maria Bałanda, Przemyslaw Zackiewicz, Bogusz Kania, Paweł Czaja, Magdalena Fitta, Maciej Szlezynger, Anna Wójcik |
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| Rok vydání: | 2016 |
| Předmět: |
010302 applied physics
Materials science Annealing (metallurgy) 02 engineering and technology Thermal treatment 021001 nanoscience & nanotechnology Condensed Matter Physics Microstructure 01 natural sciences Electronic Optical and Magnetic Materials Exchange bias Ferromagnetism Diffusionless transformation 0103 physical sciences Magnetic refrigeration Composite material 0210 nano-technology Ball mill |
| Zdroj: | Journal of Magnetism and Magnetic Materials. 401:223-230 |
| ISSN: | 0304-8853 |
| Popis: | The combined effect of ball milling and subsequent heat treatment on microstructure, magnetic, magnetocaloric and exchange bias properties of Ni48Mn39.5Sn10.5Al2 ribbons is reported. The annealing treatment results in the increase of the critical martensitic transformation temperature. The magnetic entropy change ΔSM of the order of 7.9 and −2.3 J kg K−1 for the annealed 50–32 µm powder fraction is determined. This is less than in the as melt spun ribbon but appears at a considerably higher temperature. At the same time EB is decreased due to annealing treatment. This decrease is attributed to the strengthened ferromagnetic exchange coupling due heat induced stress and structural relaxation. |
| Databáze: | OpenAIRE |
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