Title :
Magnetic properties of nanostructured TbMn6Sn6 melt-spun ribbons
Author :
Chen, C.P. ; Lin, M.D. ; Chang, H.W. ; Chiu, C.H. ; Chang, W.C.
Author_Institution :
Dept. of Phys., Nat. Chung Cheng Univ., Chia-Yi Taiwan, Taiwan
Abstract :
The effect of cooling rate on the magnetic properties of nanostructured TbMn6Sn6 melt-spun ribbons has been investigated intensively. The coercivity of TbMn6Sn6 ribbons enhances with increasing the wheel speed (Vs) from 25 to 40 m/s. In this study, the optimal magnetic properties of σr = 12.3 emu/g, iHc = 4.7 kOe at room temperature, and σr = 9.7 emu/g, iHc = 57.2 kOe at 5 K are obtained in TbMn6Sn6 ribbons quenched at Vs=35 m/s. The average grain size of optimized TbMn6Sn6 ribbons (Vs = 35 m/s) is about 30-40 nm, according to transmission electron microscopy investigation. Based on X-ray diffraction patterns, the TbMn6Sn6 ribbons mainly consist of 1 : 6 : 6-type phase. Besides, from thermal magnetic analysis, it is evidenced that only one magnetic phase having a Curie temperature of about 140°C is present in the ribbon. Exchange coupling effect is found, as evidenced by Henkel plot, to exist in all the ribbons at room temperature.
Keywords :
Curie temperature; X-ray diffraction; coercive force; exchange interactions (electron); ferromagnetic materials; grain size; manganese alloys; melt spinning; nanostructured materials; remanence; terbium alloys; tin alloys; transmission electron microscopy; 30 to 40 nm; 5 K; Curie temperature; Henkel plot; TbMn6Sn6; X-ray diffraction patterns; average grain size; coercivity; cooling rate; magnetic phase; magnetic properties; nanostructured TbMn6Sn6 melt-spun ribbons; optimal magnetic properties; thermal magnetic analysis; transmission electron microscopy; wheel speed; Coercive force; Cooling; Grain size; Magnetic analysis; Magnetic properties; Temperature; Tin; Transmission electron microscopy; Wheels; X-ray diffraction;
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.2003.815733
