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首页> 外文期刊>Journal of nanoscience and nanotechnology >Chemical Inhomogeneity in Iron Oxide @ CoO Core-Shell Nanoparticles: A Local Probe Study Using Zero-Field and In-Field Fe-57 Mossbauer Spectrometry
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Chemical Inhomogeneity in Iron Oxide @ CoO Core-Shell Nanoparticles: A Local Probe Study Using Zero-Field and In-Field Fe-57 Mossbauer Spectrometry

机译：铁氧化铁中的化学不均匀性@ CoO核心 - 壳纳米粒子：使用零场和现场Fe-57莫斯贝尔光谱法的局部探测研究

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摘要

Core-shell magnetic nanoparticles type Fe3-xO4 (approximate to 10 nm) @ CoO (approximate to 3 nm) prepared by forced hydrolysis in polyol medium have been investigated through the combined use of dc magnetization measurements by SQUID and local analysis by Fe-57 Mossbauer spectrometry. A shift of the hysteresis loop along the field axis was observed, which highlights the presence of exchange bias coupling in these nanoparticles. This exchange bias coupling is accompanied by an unexpected high value of coercive field in hysteresis loop in mode ZFC. A local probe study using both zero-field and in-field Mossbauer spectrometry reveals complex hyperfine structures. Great attention is paid to the fitting procedure: it is concluded that Fe3-xO4 @ CoO nanoparticles result from a mixture of magnetite and maghemite phases in addition to the formation of an interface-like layer close to a cobalt ferrite. Such a structure explains both the high coercive field value observed by SQUID and the presence of exchange bias coupling.
机译：通过CRE-57通过CE-57通过CO-57通过CO-57的组合使用DC磁化测量来研究通过在多元酚介质中制备的Fe3-XO4（近似为10nm）@的CoO（近似为3nm）@ CoO（近似为3nm）。莫斯堡光谱法。观察到沿场轴线的滞后环的偏移，这突出了这些纳米颗粒中的交换偏置耦合的存在。该交换偏置耦合伴随着模式ZFC中滞后环中的矫顽磁场意外高值。使用零场和现场母动蛋白光谱法的局部探测研究揭示了复杂的高血清结构。非常重视拟合程序：结论是，除了形成靠近钴铁氧体的界面状层之外，Fe3-XO4 @ CoO纳米颗粒还产生磁铁矿和磁性磁石相的混合物。这种结构解释了鱿鱼观察到的高矫顽场值和交换偏置耦合的存在。

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