Title :
Hard Magnetic Properties and Thermal Stability for TbCu7-Type SmCo6.4Si0.3Zr0.3 Alloys With Sm Substituted by Various Rare-Earth Elements
Author :
Feng, D.Y. ; Liu, Z.W. ; Zheng, Z.G. ; Zhong, X.C. ; Zhang, G.Q.
Author_Institution :
Sch. of Mater. Sci. & Eng., South China Univ. of Technol., Guangzhou, China
Abstract :
The magnetic properties and thermal stability of melt spun SmCo6.4Si0.3Zr0.3 ribbons with various rare-earth (RE) elements substituted for Sm have been investigated. It is verified that the properties´ combination of SmCo7-based ribbons can be modified by selected RE substitution. The light RE Ce is beneficial for enhancing the saturation magnetization and the remanence, while the coercivity and thermal stability can be significantly improved by heavy REs Gd, Ho, and Er substitutions. The highest room-temperature coercivity of 1467 kA/m was achieved in the Sm0.7Gd0.3Co6.4Si0.3Zr0.3 ribbon. For the temperature range of 27 °C-200 °C, Gd is the best element for enhancing the thermal stability, and the optimal temperature coefficients α and β are -0.032%/°C and -0.269%/°C, respectively. For the range of 27 °C-400 °C, Ho is the best element to improve the thermal stability, and the values of α and β are -0.064%/°C and -0.19%/°C, respectively.
Keywords :
cobalt alloys; coercive force; gadolinium alloys; melt spinning; remanence; samarium alloys; silicon alloys; thermal stability; zirconium alloys; RE substitution; Sm0.7Gd0.3Co6.4Si0.3Zr0.3; coercivity; hard magnetic properties; melt spun ribbons; rare-earth elements; remanence; saturation magnetization; temperature 27 degC to 400 degC; temperature 293 K to 298 K; temperature coefficients; thermal stability; Coercive force; Erbium; Magnetic properties; Saturation magnetization; Temperature; Thermal stability; Coercivity; SmCo7; coercivity; rare earth; rare earth (RE); thermal stability;
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.2015.2441043
