Zhang Junli, Zhu Shimeng, Ming Jun, Qiao Liang, Li Fashen, Karim Abdul, Peng Yong, Fu Jiecai
Key Laboratory of Magnetism and Magnetic Materials of the Ministry of Education, School of Physical Science and Technology, Lanzhou University, Lanzhou 730000, P. R. China.
State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, P. R. China.
Nanoscale. 2019 Aug 7;11(29):13824-13831. doi: 10.1039/c9nr01705d. Epub 2019 Jul 11.
Magnetic behaviors within nanoscopic materials are being widely explored due to their intriguing performance and widespread applications. Herein, we studied the magnetization reversal mechanism in a unique tubular nickel ferrite (NiFeO), in which the building blocks of NiFeO monocrystalline have a face-centered spinel structure and stack along the axial direction of the nanotube. We synthesized this tubular NiFeO through an electrospinning method based on a phase separation process, and then investigated the magnetization reversal process and its relationship with the morphologies using the model of "chain-of-rings" from the micromagnetism theory. This model is developed based on the morphology and crystalline orientation of nanotubes, by which the symmetric fanning mechanism is demonstrated when the angle between the magnetic field and the chain is less than 45.3°. As a result, the simulated coercivity value is confirmed to be 271 Oe, which is close to the experimental value. In addition, the rationality of this model was further verified by the calculation of the effective magnetic anisotropy field. This work is significant for the application of tubular ferrite in the field of nano-devices and fundamental research.
由于其引人入胜的性能和广泛的应用，纳米材料中的磁行为正在被广泛探索。在此，我们研究了一种独特的管状镍铁氧体（NiFeO）中的磁化反转机制，其中NiFeO单晶的构建单元具有面心立方尖晶石结构，并沿纳米管的轴向堆叠。我们通过基于相分离过程的静电纺丝方法合成了这种管状NiFeO，然后使用微磁学理论中的“环链”模型研究了磁化反转过程及其与形态的关系。该模型是基于纳米管的形态和晶体取向开发的，通过该模型证明了当磁场与链之间的角度小于45.3°时的对称扇形机制。结果，模拟的矫顽力值被确认为271 Oe，与实验值接近。此外，通过有效磁各向异性场的计算进一步验证了该模型的合理性。这项工作对于管状铁氧体在纳米器件领域的应用和基础研究具有重要意义。
