Cheng Chen, Dai Jianfeng, Li Zengpeng, Feng Wei
School of Science, Lanzhou University of Technology, Lanzhou 730050, China.
State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, Lanzhou University of Technology, Lanzhou 730050, China.
Materials (Basel). 2020 Sep 1;13(17):3860. doi: 10.3390/ma13173860.
The morphology of magnetic materials has a great influence on the properties, which is attributed to the magnetic anisotropy of the materials. Therefore, it is worth studying the fabrication of the aligned fiber and the change of its domain distribution. Nanoparticles and nanofibers were prepared by the hydrothermal and electrospinning methods, respectively. At the same time, the arranged nanofibers were collected by the drum collecting device. After the same annealing at 700 °C, it was found that the diameter of fibers collected by different collecting drums is similar. By studying the hysteresis loops of nanoarrays, it was found that they had strong anisotropy. The easy axis was parallel to the long axis, the Hc and Mr of the easy axis and the hard axis were 1330.5 Oe, 32.39 Am/kg, and 857.2 Oe, 24.8 Am/kg, respectively. Due to the anisotropy of the shape and the interaction between the particles, the Hc could not be enhanced. Therefore, the Ms and Hc of the nanoparticles were 80.23 Am/kg and 979.3 Oe, respectively. The hysteresis loop and the change of magnetic moment during the demagnetization of the CoFeO nanofiber array were simulated via micromagnetic software. The simulated Hc was 1480 Oe, which was similar to the experimental value.
磁性材料的形态对其性能有很大影响，这归因于材料的磁各向异性。因此，研究取向纤维的制备及其磁畴分布的变化是值得的。纳米颗粒和纳米纤维分别通过水热法和静电纺丝法制备。同时，通过滚筒收集装置收集排列好的纳米纤维。在700℃进行相同的退火处理后，发现不同收集滚筒收集的纤维直径相似。通过研究纳米阵列的磁滞回线，发现它们具有很强的各向异性。易轴平行于长轴，易轴和难轴的矫顽力Hc和剩余磁化强度Mr分别为1330.5 Oe、32.39 Am/kg和857.2 Oe、24.8 Am/kg。由于形状的各向异性以及颗粒之间的相互作用，矫顽力无法增强。因此，纳米颗粒的饱和磁化强度Ms和矫顽力Hc分别为80.23 Am/kg和979.3 Oe。通过微磁学软件模拟了CoFeO纳米纤维阵列退磁过程中的磁滞回线和磁矩变化。模拟得到的矫顽力Hc为1480 Oe，与实验值相似。
