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首页> 外文期刊>Physical review >X-ray magnetic circular dichroism study of the blocking process in nanostructured iron-iron oxide core-shell systems
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X-ray magnetic circular dichroism study of the blocking process in nanostructured iron-iron oxide core-shell systems

机译：X射线磁性圆二色性研究纳米结构铁-氧化铁核-壳体系中的封闭过程

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摘要

Experimental evidence for magnetothermal behavior in iron-iron oxide nanostructured systems has been obtained using x-ray absorption spectroscopy (XAS) and x-ray magnetic circular dichroism (XMCD) at the Fe L_(2,3) edges. The purpose of this study is the determination of the blocked state in these spin-glass-like core-shell systems. A first overview of the magnetic species participating in the magnetic response was obtained by analyzing the XMCD at saturating fields. Also, the XAS revealed the existence of an antiferromagnetic FeO phase, likely located at the interface regions. Finally, measurements were performed at low temperature and intermediate field, where a frozen state below the blocking energy is observed. The results show that the oxide phase spins are oriented at low temperature, while the magnetic spins of the metallic core do not contribute to the XMCD, suggesting that the blocking process mainly involves the magnetic particle superspins rather than the oxide coverage phase.
机译：使用X射线吸收光谱（XAS）和X射线磁性圆二色性（XMCD）在Fe L_（2,3）边缘获得了铁-氧化铁纳米结构系统中磁热行为的实验证据。这项研究的目的是确定这些自旋玻璃状核壳系统中的阻塞状态。通过分析饱和磁场下的XMCD获得了参与磁响应的磁性物种的第一概貌。另外，XAS揭示了反铁磁性FeO相的存在，可能位于界面区域。最后，在低温和中间磁场下进行测量，观察到低于阻断能的冻结状态。结果表明，氧化物相自旋在低温下取向，而金属核的磁自旋对XMCD没有贡献，这表明阻挡过程主要涉及磁性粒子超自旋而不是氧化物覆盖相。

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  • 来源
    《Physical review》 |2011年第17期|p.172404.1-172404.5|共5页
  • 作者

    F. Jimenez-Villacorta; C. Prieto; Y. Huttel; N. D. Telling; G. van der Laan;

  • 作者单位

    Department of Chemical Engineering, Northeastern University, Boston, Massachusetts 02115, USA;

    Instituto de Ciencia de Materiales de Madrid, CSIC, Cantoblanco, E-28049 Madrid, Spain;

    Instituto de Ciencia de Materiales de Madrid, CSIC, Cantoblanco, E-28049 Madrid, Spain;

    Institute for Science and Technology in Medicine (ISTM), Guy Hilton Research Centre, Keele University, Thornburrow Drive, Hartshill, Stoke-on-Trent ST4 7QB, United Kingdom;

    Diamond Light Source, Chilton, Didcot, Oxfordshire OX 11 ODE, United Kingdom;

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  • 正文语种 eng
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  • 关键词

    fine-particle systems; nanocrystalline materials; X-ray absorption spectra;

    机译：细颗粒系统;纳米晶体材料;X射线吸收光谱;

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