Cerium-based RCo5 (R = Ce, La0.35Ce0.65, and misch-metal) type nanocrystalline hard magnetic materials with high coercivity
Wen-Liang Zuo,
Jeotikanta Mohapatra,
J. Ping Liu,
Tong-Yun Zhao,
Feng-Xia Hu,
Ji-Rong Sun,
Yong-Feng Li,
Xue-Feng Zhang,
Bao-Gen Shen
Affiliations
Wen-Liang Zuo
School of Sciences, MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter, Xi’an Jiaotong University, Xi’an, Shaanxi 710049, China
Jeotikanta Mohapatra
Department of Physics, The University of Texas at Arlington, Arlington, Texas 76019, USA
J. Ping Liu
Department of Physics, The University of Texas at Arlington, Arlington, Texas 76019, USA
Tong-Yun Zhao
State Key Laboratory of Magnetism, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People’s Republic of China
Feng-Xia Hu
State Key Laboratory of Magnetism, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People’s Republic of China
Ji-Rong Sun
State Key Laboratory of Magnetism, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People’s Republic of China
Yong-Feng Li
School of Sciences, Inner Mongolia University of Science and Technology, Baotou 014010, People’s Republic of China
Xue-Feng Zhang
School of Sciences, Inner Mongolia University of Science and Technology, Baotou 014010, People’s Republic of China
Bao-Gen Shen
State Key Laboratory of Magnetism, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People’s Republic of China
Nanocrystalline RCo5 (R = Ce, La0.35Ce0.65, and misch-metal noted as MM) ribbons with hexagonal crystal structure and an average grain size of 5 nm have been prepared via a one-step melt-spinning technique. Coercivity as high as 13.0, 13.8, and 10.9 kOe has been obtained at 300 K for the CeCo5, La0.35Ce0.65Co5, and MMCo5 ribbons, respectively. High thermal stability is also achieved as shown by the high coercivity of 9.3 kOe, 10.2 kOe, and 8.8 kOe at 400 K for CeCo5, La0.35Ce0.65Co5, and MMCo5 ribbons, respectively. The coercivity mechanism is studied by magnetization analysis and microstructural observations. The nanocrystalline grains promote a strong exchange interaction, as indicated by the positive δM and the relatively high remanence ratio (∼0.8). In addition, the temperature dependence of coercivity of RCo5 ribbons shows the low coercivity temperature coefficient of −0.2% to −0.25%/K.
