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arXiv 1611.04735cond-mat.mtrl-scicond-mat.soft
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用于制备永磁体的Co纳米线/ polymer复合材料的磁性能优化

Optimization of the magnetic properties of aligned Co nanowires/polymer composites for the fabrication of permanent magnets

Weiqing Fang, Ioannis Panagiotopoulos, Frédéric Ott, François Boué, Ait-Atmane Kahina, Jean-Yves Piquemal, Guillaume Viau, Florent Dalmas

摘要:

我们的目标是在聚合物基体中结合高矫顽力的磁性纳米线,以制备无稀土粘结磁体。特别是,我们的目标是通过对齐聚合物基体中的线来制造各向异性材料。我们已经探索了制造过程的不同参数,以生产具有最佳磁性能的材料。我们表明,选择适当的溶剂可以获得稳定的纳米线悬浮液。聚合物链的长度和类型也起重要作用。较小的链($M_w < 10000$)提供更好的磁化结果。在材料的铸造期间施加的磁场也起作用,并且应该是特斯拉的分数的量级。用TEM和小角中子散射表征了纳米线在基体中的局部有序性。讨论了线的局域有序度与磁性能之间的关系。得到了室温下结晶度$μ_0 H_c$达0.70 $T$的材料。

英文摘要:

We aim at combining high coercivity magnetic nanowires in a polymer matrix in a view to fabricate rare--earth free bonded magnets. In particular, our aim is to fabricate anisotropic materials by aligning the wires in the polymer matrix. We have explored the different parameters of the fabrication process in order to produce a material with the best possible magnetic properties. We show that the choice of a proper solvent allows obtaining stable nanowire suspensions. The length and the type of the polymer chains play also an important role. Smaller chains ($M_w < 10000$) provide better magnetization results. The magnetic field applied during the casting of the material plays also a role and should be of the order of a fraction of a tesla. The local order of the nanowires in the matrix has been characterized by TEM and Small Angle Neutron Scattering. The correlation between the local order of the wires and the magnetic properties is discussed. Materials with coercivity $μ_0 H_c$ up to 0.70 $T$ at room temperature have been obtained.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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