Rietveld refinement, microstructure and ferromagnetic resonance linewidth of iron-deficiency NiCuZn ferrites
Rietveld refinement, microstructure and ferromagnetic resonance linewidth of iron-deficiency NiCuZn ferrites
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缺铁NiCuZn铁氧体的Rietveld细化、显微结构和铁磁共振线宽
DOI：
10.1016/j.jallcom.2016.04.164
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发表时间：
2016-10
影响因子：
6.2
通讯作者：
Lan Zhongwen
中科院分区：
文献类型：
--
作者：
Sun Ke;Pu Zhiyong;Yang Yan;Chen Linglong;Yu Zhong;Wu Chuanjian;Jiang Xiaona;Lan Zhongwen
采用固相反应法制备了Ni0.56+x/2Zn0.34Cu0.1Fe2.0-xO4-x（x= 0,0.02, 0.04, 0.06, 0.08, 0.12）铁氧体。采用x射线衍射仪、扫描电镜（SEM）、B-H分析仪和电子自旋共振（ESR）谱仪分别对NiCuZn铁氧体的x射线衍射图、微观结构、静态磁性能和铁磁共振（FMR）线宽进行了Rietveld细化分析。采用基于自旋波法的近似计算方法研究了FMR线宽。结果表明，所有样品均为单一NiCuZn尖晶石相。随着缺铁量的增加，晶格参数(a)呈下降趋势。堆积密度先快速增加，后略有上升趋势。化学计量镍锌铁氧体的饱和磁化强度远低于缺铁样品。这种现象归因于分子磁矩和体积密度的共同作用。讨论了由接近饱和定律导出的磁晶各向异性常数。采用各向异性模型和孔隙度线宽展宽模型来确定线宽贡献。结果表明，孔隙度线宽展宽比各向异性线宽展宽大得多。
Ni0.56+x/2Zn0.34Cu0.1Fe2.0-xO4-x(x= 0, 0.02, 0.04, 0.06, 0.08, 0.12) ferrites have been prepared by the solid-state reaction method. The Rietveld refinement of X-ray diffraction patterns, microstructure, static magnetic properties and ferromagnetic resonance (FMR) linewidth of NiCuZn ferrites have been analyzed by X-ray diffraction, scanning electron microscopy (SEM), B-H analyzer and electron spin resonance (ESR) spectrometer, respectively. The FMR linewidth was investigated by an approximate calculation based on spin wave approach. The results revealed that all the samples were a single NiCuZn spinel phase. With the increase of iron-deficient amount, the lattice parameter (a) displayed a decreasing trend. However, the bulk density first increased rapidly and then trended to go up slightly. The saturation magnetization of stoichiometric NiCuZn ferrites was much lower than that of iron-deficient samples. This phenomenon is ascribed to the combined effect between molecule magnetic moment and bulk density. The magnetocrystalline anisotropy constant, derived from the law of approach to saturation, has been discussed. The anisotropy and porosity linewidth broadening models were adopted to identify the linewidth contribution. The results manifested that the porosity linewidth broadening was much larger than the anisotropy linewidth broadening.
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