Abstract
It was found that Co50Ni20Gax (x=0–40) melt-spun ribbons were ferromagnetic, but Co50Ni20Ga40 melt-spun ribbon was paramagnetic at room temperature. The addition of Ga to Co–Ni melt-spun ribbon significantly reduced the saturation magnetization. It was also found that the Curie temperature of the β phase in Co50Ni20Gax (x=20–30) melt-spun ribbons was around 300K and that of the β phase in Co50Ni20Ga40 melt-spun ribbon was 110K. Unlike the other Co–Ni–Ga melt-spun ribbons, Co50Ni20Ga30 melt-spun ribbon exhibited a coercivity of 1.0kOe after annealing at 773K for 1h.
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