Evidence of exchange coupling in τ-MnAlC/FeCo system
| Autor: | G. A. Pérez Alcázar, J. S. Trujillo Hernandez, L. E. Zamora Alfonso, H. Martínez Sánchez |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
010302 applied physics
Work (thermodynamics) Materials science Condensed matter physics Sintering 02 engineering and technology Coercivity 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Electronic Optical and Magnetic Materials Remanence Magnet Phase (matter) 0103 physical sciences Coupling (piping) Magnetic phase 0210 nano-technology |
| Zdroj: | Journal of Magnetism and Magnetic Materials. 473:221-227 |
| ISSN: | 0304-8853 |
| Popis: | The τ -MnAlC/FeCo system has potential to be applied as rare earth-free permanent magnet, due to exchange coupled between hard and soft magnetic phases as alternative for the development of high energy product permanent magnets. In this work the hard-magnetic phase Mn53.3Al45C1.7 ( μ 0Hc = 0.37 T of coercive force, Mr = 23.52 Am2/kg of remanent magnetization, Ms = 52.94 Am2/kg of saturation magnetization and (BH)max = 3.89 kJ/m3 of maximum energy product) was mixed with the soft magnetic phase Fe65Co35 ( μ 0Hc = 0.007 T and Ms = 221.33 Am2/kg) using a solid-state procedure. The magnetic materials were sintered using different ratios of hard and soft magnetic phases: 95:5, 90:10, 85:15 and 80:20; and different sintering temperatures (300, 400, 500 and 600 °C) in order to improve the magnetic properties. The magnetic exchange coupling between MnAlC and FeCo was proved by the hysteresis loop and its corresponding Thamm-Hesse analysis. The best result was obtained for MnAlC/FeCo (95/5 wt%) sintered at 500 °C during 30 min, for which the magnetic properties were μ 0Hc = 0.277 T, Ms = 76.43 Am2/kg and (BH)max = 5.57 kJ/m3. |
| Databáze: | OpenAIRE |
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