Magnetic properties of melt-spun Sm{sub 2+{delta}}Fe{sub 15}Ga{sub 2}C{sub 2} permanent magnets
- Max-Planck-Institut fuer Metallforschung, Heisenbergstrasse 1, D-70569 Stuttgart (Germany)
The change in the magnetic properties of melt-spun Sm{sub 2+{delta}}Fe{sub 15}Ga{sub 2}C{sub 2} permanent magnets with variation of the Sm content {delta} has been investigated in the range of {minus}0.05{le}{delta}{le}0.20. A drastic increase in the coercive field {mu}{sub 0}H{sub C} from 1.5 to 2.2 T at room temperature has been observed for {delta}{ge}0.1. This can be understood as an influence of the Sm-rich nonmagnetic intergranular phase, occurring due to the Sm excess. Room temperature values of the maximum energy density up to (BH){sub max}=64.2kJ/m{sup 3} ({delta}=0.03) can be obtained. The samples with higher Sm contents exhibit larger values of the maximum energy density at elevated temperatures (T{ge}450K). For {delta}=0.13, a value of (BH){sub max}=31.4kJ/m{sup 3} has been observed at 500 K. The microstructural parameters {alpha}{sub K} and N{sub eff} describing the influence of the nonideal microstructure on the coercive field in the framework of the nucleation model were determined from the temperature dependence of the coercive field. {copyright} {ital 1997 American Institute of Physics.}
- OSTI ID:
- 560607
- Journal Information:
- Journal of Applied Physics, Vol. 82, Issue 5; Other Information: PBD: Sep 1997
- Country of Publication:
- United States
- Language:
- English
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