Presentation Information
[P2-39]Magnetic properties of (Sm,Y)Fe2Co2B melt-spun ribbons
*Tetsuji Saito1 (1. Chiba Institute of Technology (Japan))
Keywords:
SmFe2Co2B,Permanent magnet,melt-spinning,coercivity
Research on new permanent magnet materials has focused on developing rare-earth intermetallic compounds. It is well known that the SmCo5 compound has high magnetocrystalline anisotropy and that Sm-Co magnets with the SmCo5 phase exhibit high coercivity [1,2]. It has been shown that Sm-Co-B alloys possess a higher anisotropy field than the SmCo5 phase. For example, the SmCo4B compound has an extremely high anisotropy field of 1200 kOe at 4.2 K, much higher than the 710 kOe exhibited by the SmCo5 compound at the same temperature. Several attempts have been made to produce the SmCo4B and Fe-substituted SmFe2Co2B compounds [3-6]. The substitution of Y for Sm in the SmFe2Co2B phase may change the crystal structure and magnetic properties. Thus, (Sm,Y)Fe2Co2B specimens were prepared by melt-spinning and subsequent annealing. The magnetic properties of the resultant (Sm,Y)Fe2Co2B melt-spun ribbons were studied.
(Sm,Y)Fe2Co2B alloy ingots were produced in a quartz crucible by induction melting in an argon atmosphere. These alloys were melt-spun in argon onto a rotating copper wheel substrate. Small amounts of the melt-spun ribbons were annealed at 773–1173 K for 1 h. As-quenched (Sm,Y)Fe2Co2B specimens mainly consisted of the amorphous phase. Subsequent annealing resulted in the formation of the (Sm,Y)Fe2Co2B phase. The annealed specimens exhibited high coercivity, with the value depending on the composition and annealing temperature. The SmFe2Co2B melt-spun ribbon showed a high coercivity of 8.25kOe when annealed at 973 K, while the Sm0.75Y0.25Fe2Co2B melt-spun ribbon exhibited extremely high coercivity over 25 kOe when annealed at 973 K (Figure 1).
References[1] K. J. Strnat, IEEE. Trans. Magn. 8 (1972) 511. [2] A. Riley, J. Less-Common Met. 44 (1976) 307. [3] H. Ido, O. Nashima, T. Takahashi, K. Oda, K. Sugiyama, J. Appl. Phys. 76 (1994) 6165. [4] W. Gong, G. C. Hadjipanayis, IEEE Trans. Magn. 32 (1996) 4392. [5] X. Jiang, A. Devaraj, B. Balamurugan, J. Cui, J. E. Shield, J. Appl. Phys. 115 (2014) 063902. [6] T. Saito and D. Nishio-Hamane, Intermetallics 107 (2019) 6
(Sm,Y)Fe2Co2B alloy ingots were produced in a quartz crucible by induction melting in an argon atmosphere. These alloys were melt-spun in argon onto a rotating copper wheel substrate. Small amounts of the melt-spun ribbons were annealed at 773–1173 K for 1 h. As-quenched (Sm,Y)Fe2Co2B specimens mainly consisted of the amorphous phase. Subsequent annealing resulted in the formation of the (Sm,Y)Fe2Co2B phase. The annealed specimens exhibited high coercivity, with the value depending on the composition and annealing temperature. The SmFe2Co2B melt-spun ribbon showed a high coercivity of 8.25kOe when annealed at 973 K, while the Sm0.75Y0.25Fe2Co2B melt-spun ribbon exhibited extremely high coercivity over 25 kOe when annealed at 973 K (Figure 1).
References[1] K. J. Strnat, IEEE. Trans. Magn. 8 (1972) 511. [2] A. Riley, J. Less-Common Met. 44 (1976) 307. [3] H. Ido, O. Nashima, T. Takahashi, K. Oda, K. Sugiyama, J. Appl. Phys. 76 (1994) 6165. [4] W. Gong, G. C. Hadjipanayis, IEEE Trans. Magn. 32 (1996) 4392. [5] X. Jiang, A. Devaraj, B. Balamurugan, J. Cui, J. E. Shield, J. Appl. Phys. 115 (2014) 063902. [6] T. Saito and D. Nishio-Hamane, Intermetallics 107 (2019) 6
