Cu-doped nanocomposite Pr_(2)Fe_(14)B/α-Fe ribbons with high(BH)max  

作　　者：Mehran Khan Alam Shahzab Raza Chengyong Gao Guangbing Han Shishou Kang Mehran Khan Alam;Shahzab Raza;高成勇;韩广兵;康仕寿(School of Physics,Shandong University,Jinan 250100,China)

机构地区：[1]School of Physics,Shandong University,Jinan 250100,China

出　　处：《Chinese Physics B》2024年第12期422-429,共8页中国物理B（英文版）

基　　金：Project supported by the National Natural Science Foundation of China(Grant Nos.12074220 and 11627805);the National Key Research and Development Program of China(Grant No.2023YFA1406604)。

摘　　要：The melt-spun ribbons of nominal composition Pr_(9)Fe_(84.2-x)B_(6.2)P_(0.3)Zr_(0.3)Cu_(x)(x=0,0.5,1,2)were prepared at wheel speeds of 21 m·s^(-1),27 m·s^(-1),30 m·s^(-1),and 33 m·s^(-1).The XRD patterns show that as the wheel speed increases,the crystallinity of the 2:14:1 hard phase decreases,while that of theα-Fe soft phase increases.The(BH)_(max),remanence,and coercivity are improved from 63 kJ·m^(-3),0.85 T,and 515 kA·m^(-1)for the Cu-free ribbons to 171 kJ·m^(-3),1.08 T,and684 kA·m^(-1)with x=0.5.The high squareness ratio of J_(r)/J_(s)~0.82 at 0.5 at.%Cu(27 m·s^(-1))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 m·s^(-1)),contributing to the high magnetic properties.The low recoil permeability(μrec)value of 5.466×10^(-4)T/kA·m^(-1)to 1.970×10^(-4)T/kA·m^(-1)confirms the strong exchange coupling with x=0.5(27m·s^(-1)).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 kA·m^(-1)(33 m·s^(-1)).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.

关 键 词：Cu addition NANOCOMPOSITE magnetic properties energy product REMANENCE 

分 类 号：O469[理学—凝聚态物理]