High coercivity in rapidly quenched Sm(Fe, T)12-type magnets

Singleton, E. W.; Strzeszewski, J.; Hadjipanayis, G. C.
May 1989
Applied Physics Letters;5/8/1989, Vol. 54 Issue 19, p1934
Academic Journal
The magnetic and structural properties of melt-spun Sm(FeT)12 alloys where T=Ti,V,Al,Cu,Ga,Si and with some containing small amounts of B and C have been studied. The samples are magnetically soft in the as-quenched state. High coercive fields are developed upon heating the samples at temperatures ranging from 750 to 1050 °C. The tetragonal ThMn12-type structure was found in all the alloys after annealing. The highest coercivities have been obtained on a Sm10Fe80Ti7.5B2.5 sample with Hc [bar_over_tilde:_approx._equal_to]7.7 kOe. These coercivities are much higher than those obtained previously and make these alloys good candidates for permanent magnet development.


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