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首页> 外文期刊>Applied Magnetic Resonance >Dopant Spin States and Magnetic Interactions in Transition Metal (Fe3+)-Doped Semiconductor Nanoparticles: An EMR and Magnetometric Study
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Dopant Spin States and Magnetic Interactions in Transition Metal (Fe3+)-Doped Semiconductor Nanoparticles: An EMR and Magnetometric Study

机译：掺杂过渡金属（Fe3 +）的半导体纳米粒子中的掺杂物自旋态和磁性相互作用：EMR和磁力分析

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摘要

In this work, electron magnetic resonance (EMR) spectroscopy and magnetometry studies were employed to investigate the origin of the observed room-temperature ferromagnetism in chemically synthesized Sn1-x Fe (x) O-2 powders. EMR data clearly established the presence of two different types of signals due to the incorporated Fe ions: paramagnetic spectra due to isolated Fe3+ ions and broad ferromagnetic resonance (FMR) spectra due to magnetically coupled Fe3+ dopant ions. EMR data analysis and simulation suggested the presence of high-spin (S = 5/2) Fe3+ ions incorporated into the SnO2 host lattice both at substitutional and at interstitial sites. The FMR signal intensity and the saturation magnetization M (s) of the ferromagnetic component increased with increasing Fe concentration. For Sn0.953Fe0.047O2 samples, well-defined EMR spectra revealing FMRs were observed only for samples prepared in the 350-600A degrees C range, whereas for samples prepared at higher annealing temperatures up to 900A degrees C, the FMRs and saturation magnetization were vanished due to diffusion and eventual expulsion of the Fe ions from the nanoparticles, in agreement with data obtained from Raman and X-ray photoelectron spectroscopy.
机译：在这项工作中，电子磁共振（EMR）光谱学和磁力测量研究被用来调查化学合成的Sn1-x Fe（x）O-2粉末中观察到的室温铁磁性的起源。 EMR数据清楚地表明由于掺入了Fe离子而存在两种不同类型的信号：由于孤立的Fe3 +离子导致的顺磁光谱和由于磁耦合的Fe3 +掺杂离子导致的宽铁磁共振（FMR）光谱。 EMR数据分析和模拟表明，在替代位点和间隙位点处都存在掺入SnO2主晶格中的高自旋（S = 5/2）Fe3 +离子。铁磁性成分的FMR信号强度和饱和磁化强度M（s）随着Fe浓度的增加而增加。对于Sn0.953Fe0.047O2样品，仅在350-600A摄氏度范围内制备的样品中观察到清晰的EMR光谱，揭示了FMR，而对于在高达900A摄氏度的较高退火温度下制备的样品，FMR和饱和磁化强度为与从拉曼和X射线光电子能谱获得的数据相一致，归因于Fe离子从纳米颗粒的扩散和最终排出而消失。

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