Abstract The melt-spun ribbons of nominal composition PrFeBPZrCu (, 0.5, 1, 2) were prepared at wheel speeds of 21 ms, 27 ms, 30 ms, and 33 ms. The XRD patterns show that as the wheel speed increases, the crystallinity of the 2:14:1 hard phase decreases, while that of the -Fe soft phase increases. The , remanence, and coercivity are improved from 63 kJm, 0.85 T, and 515 kAm for the Cu-free ribbons to 171 kJm, 1.08 T, and 684 kAm with . The high squareness ratio of at 0.5 at.% Cu (27 ms) indicates strong exchange coupling due to small grain sizes of 15 nm and 30 nm for soft and hard magnetic phases, respectively. The SEM images revealed smooth morphology and uniform element distribution at 0.5 at.% Cu (27 ms), contributing to the high magnetic properties. The low recoil permeability () value of T/kAm to T/kAm confirms the strong exchange coupling with (27 ms). The initial magnetization curves show that the coercivity mechanism of the Cu-free alloy evolves from the nucleation of the reverse domain to the domain wall pinning as the wheel speed increases, resulting in a high coercivity value of 818 kAm (33 ms). Conversely, for the Cu-added alloy, the coercivity mechanism changes from pinning to the nucleation of the reverse domain from low to high wheel speed.
Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 12074220 and 11627805) and the National Key Research and Development Program of China (Grant No. 2023YFA1406604).
Corresponding Authors:
Guangbing Han, Shishou Kang
E-mail: hangb@sdu.edu.cn;skang@sdu.edu.cn
Cite this article:
Mehran Khan Alam, Shahzab Raza, Chengyong Gao(高成勇), Guangbing Han(韩广兵), and Shishou Kang(康仕寿) Cu-doped nanocomposite Pr2Fe14B/α-Fe ribbons with high (BH)max 2024 Chin. Phys. B 33 127504
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