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Magnetization Process in Co-Zr-B permanent-magnet materials

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1 Author(s)
Saito, Tetsuji ; Dept. of Mech. Sci. & Eng., Chiba Inst. of Technol., Japan

Co-Zr-B alloy ingots consisted of Co23Zr6 phase together with the small amounts of Co5Zr and Co3ZrB2 phases. On the other hand, Co-Zr-B melt-spun ribbons consisted mostly of Co5Zr phase and exhibited a high coercivity. Heat treatment of the Co-Zr-B melt-spun ribbons resulted in increased coercivity. These annealed Co-Zr-B melt-spun ribbons were magnetically isotropic. The maximum energy products (BH)max values in excess of 4.7 MGOe were observed for the Co-Zr-B melt-spun ribbons annealed at 600°C for 1 h. The mechanism underlying the coercivity of the annealed Co-Zr-B melt-spun ribbon was found to be the pinning type from the initial magnetization curve.

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Magnetics, IEEE Transactions on  (Volume:40 ,  Issue: 4 )