VP9-08 Magnetic properties of Sm(Fe,Ga)7C melt-spun ribbons
Creators: Tetsuji Saito and Daisuke Nishio-Hamane
Publisher: name: IEEE
Year: 2025

The Sm2Fe17N3 phase possesses a high saturation magnetization with a large anisotropy field and a high Curie temperature [1]. Many fundamental investigations have been carried out on the Sm2Fe17N3 phase [2-5]. Sm2Fe17N3 has been prepared in powder form by the nitrogenation of Sm2Fe17 alloy powder. It would be desirable if the magnetic properties of the Sm2Fe17 phase could be increased without the need for nitrogenation. Thus, we seek to produce high-coercivity Sm-Fe alloys without nitrogenation. This study discusses the structures and magnetic properties of Sm-Fe-Ga-C alloys produced by melt-spinning. Sm(Fe,Ga)7C alloy ingots were prepared by induction melting under an argon atmosphere. The molten alloy ingots were then ejected through an orifice with argon onto a copper wheel rotating at a surface velocity of 40 ms-1. The melt-spun ribbons obtained through this process were annealed under an argon atmosphere at 873–1073 K for 0–1 h. The specimens were examined by an X-ray diffraction (XRD) system, transmission electron microscope (TEM), and vibrating sample magnetometer (VSM). The Sm(Fe,Ga)7C melt-spun ribbons consisted of either amorphous or the TbCu7-type phase. These ribbons showed low coercivity of less than 1 kOe. The coercivity of the Sm(Fe,Ga)7C melt-spun ribbons increased as the annealing temperature increased. The highest coercivity of 12.6 kOe was achieved in the Sm(Fe,Ga)7C melt-spun ribbon annealed at 1073 K (Fig.1).References: [1] J. M. D. Coey and H. Sun, J. Magn. Magn. Mater. 87, L251 (1990). [2] K. Schnitzke, L. Schultz, J. Wecker, and M. Katter, Appl. Phys. Lett. 57, 2853 (1990). [3] J. P. Liu, K. Bakker, P. R. de Boer, T. H. Jacobs, D. B. de Mooij, and K. H. J. Buschow, J. Less-Common Met. 170,109 (1991). [4] S. Miraglia, J. L. Soubeyroux, C. Kolbeck, O. Isnard, and D. Fruchrat, J. Less-Common Met. 171, 51 (1991). [5] T. Iriyama, K. Kobayashi, and H. Imai, IEEE Trans. Magn. 28, 2326 (1992).
The Sm2Fe17N3 phase possesses a high saturation magnetization with a large anisotropy field and a high Curie temperature [1]. Many fundamental investigations have been carried out on the Sm2Fe17N3 phase [2-5]. Sm2Fe17N3 has been prepared in powder form by the nitrogenation of Sm2Fe17 alloy powder. It would be desirable if the magnetic properties of the Sm2Fe17 phase could be increased without the need for nitrogenation. Thus, we seek to produce high-coercivity Sm-Fe alloys without nitrogenation. This study discusses the structures and magnetic properties of Sm-Fe-Ga-C alloys produced by melt-spinning. Sm(Fe,Ga)7C alloy ingots were prepared by induction melting under an argon atmosphere. The molten alloy ingots were then ejected through an orifice with argon onto a copper wheel rotating at a surface velocity of 40 ms-1. The melt-spun ribbons obtained through this process were annealed under an argon atmosphere at 873–1073 K for 0–1 h. The specimens were examined by an X-ray diffraction (XRD) system, transmission electron microscope (TEM), and vibrating sample magnetometer (VSM). The Sm(Fe,Ga)7C melt-spun ribbons consisted of either amorphous or the TbCu7-type phase. These ribbons showed low coercivity of less than 1 kOe. The coercivity of the Sm(Fe,Ga)7C melt-spun ribbons increased as the annealing temperature increased. The highest coercivity of 12.6 kOe was achieved in the Sm(Fe,Ga)7C melt-spun ribbon annealed at 1073 K (Fig.1).References: [1] J. M. D. Coey and H. Sun, J. Magn. Magn. Mater. 87, L251 (1990). [2] K. Schnitzke, L. Schultz, J. Wecker, and M. Katter, Appl. Phys. Lett. 57, 2853 (1990). [3] J. P. Liu, K. Bakker, P. R. de Boer, T. H. Jacobs, D. B. de Mooij, and K. H. J. Buschow, J. Less-Common Met. 170,109 (1991). [4] S. Miraglia, J. L. Soubeyroux, C. Kolbeck, O. Isnard, and D. Fruchrat, J. Less-Common Met. 171, 51 (1991). [5] T. Iriyama, K. Kobayashi, and H. Imai, IEEE Trans. Magn. 28, 2326 (1992).