电纺Cu $_{1-x}$ Zn $_x$ Fe $_2$ O $_4$纳米纤维的微结构和磁各向异性：局域探针研究
Microstructure and magnetic anisotropy of electrospun Cu$_{1-x}$Zn$_x$Fe$_2$O$_4$ nanofibers: A local probe study
摘要：
理解纳米尺度下的现象对于未来改进纳米材料的期望性能具有根本的重要性。我们报告的微观结构和由此产生的磁各向异性的详细调查的磁性，透射电子显微镜（TEM）和穆斯堡尔测量的电纺铜$_{1-x}$锌$_x$铁$_2$ O $_4$纳米纤维。结果表明，静电纺Cu $_{1-x}$ Zn $_x$ Fe $_2$ O $_4$纳米纤维具有近各向同性的磁各向异性。TEM测量表明，纳米纤维是由松散连接和随机排列的纳米颗粒。如Henkel图所示，这些纳米纤维和纳米纤维内的纳米颗粒是偶极耦合的，这降低了有效的形状各向异性，导致纳米纤维内的磁矩的几乎随机的配置，因此，可以容易地理解所观察到的几乎各向同性的磁各向异性。
英文摘要：
Understanding the phenomena at the nanometer scale is of fundamental importance for future improvements of desired properties of nanomaterials. We report a detailed investigation of the microstructure and the resulting magnetic anisotropy by magnetic, transmission electron microscope (TEM) and Mössbauer measurements of the electrospun Cu$_{1-x}$Zn$_x$Fe$_2$O$_4$ nanofibers. Our results show that the electrospun Cu$_{1-x}$Zn$_x$Fe$_2$O$_4$ nanofibers exhibit nearly isotropic magnetic anisotropy. TEM measurements indicate that the nanofibers are composed of loosely connected and randomly aligned nanograins. As revealed by the Henkel plot, these nanofibers and the nanograins within the nanofibers are dipolar coupled, which reduces the effective shape anisotropy leading to a nearly random configuration of the magnetic moments inside the nanofibers, hence, the observed nearly isotropic magnetic anisotropy can be easily understood.
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