Microchemistry and magnetization reversal mechanism in melt-spun 2:17-type Sm-Co magnets

Yan, A.; Gutfleisch, O.; Gemming, T.; Müller, K. H.
September 2003
Applied Physics Letters;9/15/2003, Vol. 83 Issue 11, p2208
Academic Journal
The stability of microstructure and of microchemistry in melt-spun precipitation-hardened Sm(Co,Fe,Cu,Zr)[sub z] magnets at high temperature and its effect on the magnetic properties, especially the coercivity at room temperature, were investigated by transmission electron microscopy, nanoprobe chemical analysis, and magnetic measurements. A very large gradient of the Cu content within the 1:5-type cell boundary phase was observed in highly coercive melt-spun Sm(Co,Fe,Cu,Zr)[sub z] magnets with uniform cellular structure. After an additional isothermal aging at 850 °C for 5 min, the coercivity is reduced dramatically from 3 T to 0.16 T. This is accompanied by the disappearance of the large gradient of Cu content within the cell boundary phase. Thus, it is proposed that the high coercivity in 2:17 Sm-Co magnets originates from the large gradient of domain wall energy within the Sm(Co,Cu)[sub 5] cell boundary phase. This gradient is caused by a very rapid phase separation taking place within the cell boundary phase during slow cooling. © 2003 American Institute of Physics.


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