Abstract We fabricated nanoparticles of Zn ferrite of the chemical formula ZnFe2O4 using the auto-combustion technique, and investigated their magnetic spin distribution and frequency response to optical excitation. Optical absorption and magnetic characterization of the nanoparticles were carried out in the UV-Vis and IR range, and extended on the low frequency side down to the THz domain. The nanoparticles were also characterized by X-ray diffraction and by magnetic force microscopy. The optical dielectric constant was calculated in both the UV-Vis and the THz domain. The optical bandgap, the dispersion energy and the oscillator strength of the nanoparticles were calculated from the optical data based on the single oscillator model. We measured the optical absorption, transmission and reflection spectra in the wavelength range from 200 to 800 nm, and calculated the refractive index, absorption and extinction coefficient. The optical band gap was found to be 1.14 eV and the oscillating energy of the dipole was determined to be 6.94 eV. The study shows that the coordination number of a metal complex and the symmetrical arrangement play an important role in determining the nanoparticle properties.

中文翻译：

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铁氧体锌纳米粒子在太赫兹频率范围内磁自旋的扩展特性

摘要 我们使用自燃技术制备了化学式为 ZnFe2O4 的 ZnFe2O4 铁氧体纳米颗粒，并研究了它们的磁自旋分布和对光激发的频率响应。纳米粒子的光学吸收和磁性表征在 UV-Vis 和 IR 范围内进行，并在低频侧扩展到 THz 域。纳米颗粒还通过 X 射线衍射和磁力显微镜表征。在 UV-Vis 和 THz 域中计算了光学介电常数。纳米粒子的光学带隙、色散能和振子强度由基于单振子模型的光学数据计算得到。我们测量了 200 到 800 nm 波长范围内的光吸收、透射和反射光谱，并计算了折射率、吸收和消光系数。发现光学带隙为 1.14 eV，偶极子的振荡能量确定为 6.94 eV。研究表明，金属配合物的配位数和对称排列在决定纳米粒子的性质方面起着重要作用。