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It is well known that an SmCo_5 magnet quenched at about 900℃ has high coercivity _iH_c. But annealing at about 700℃ causes a rapid decrease of iH_c. It has been considered that the drop of _iH_c is caused by the precipitation of Sm_2Co_(17) phase in the SmCo_5 matrix, and the precipitates act as the centers of reversed magnetic do-
It has been well known that that an SmCo_5 magnet quenched at about 900 ° C has high coercivity _iH_c. But annealing at about 700 ° C causes a rapid decrease of iH_c. It has been considered that the drop of _iH_c is caused by the precipitation of Sm_2Co_ (17) phase in the SmCo_5 matrix, and the precipitates act as the centers of reversed magnetic do-