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arXiv 1209.4265cond-mat.mes-hallcond-mat.mtrl-sci
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金属和半导体碳纳米管中一维铁的轨道和自旋磁矩

Orbital and spin magnetic moments of transforming 1D iron inside metallic and semiconducting carbon nanotubes

Antonio Briones-Leon, Paola Ayala, Xianjie Liu, Hiromichi Kataura, Kazuhiro Yanagi, Eugen Weschke, Michael Eisterer, Thomas Pichler, Hidetsugu Shiozawa

摘要:

利用局域X射线磁性圆二色性(XMCD)和体超导量子干涉仪(SQUID)研究了一维碳纳米管杂化材料中铁的轨道和自旋磁性.纳米管混合物最初是二茂铁填充的不同金属性的单壁碳纳米管(SWCNT)。经过高温纳米化学反应后,二茂铁分子相互反应形成铁纳米团簇。我们发现,二茂铁分子轨道的相互作用不同的单壁碳纳米管的不同金属没有显着的XMCD响应。这种XMCD在不同的温度和磁场揭示了轨道和/或自旋磁矩的封装铁急剧改变的转变为一维Fe纳米团簇发生。轨道和自旋磁矩都被发现是在填充的半导体纳米管比在金属样品更大。这可能意味着封装材料的磁极化取决于管的金属性。从铁的3d磁矩和体磁SQUID测量之间的比较,我们得出结论,离域的磁性决定了这些一维混合纳米结构的磁性。

英文摘要:

The orbital and spin magnetic properties of iron inside transforming metallic and semiconducting 1D carbon nanotube hybrids are studied by means of local x-ray magnetic circular dichroism (XMCD) and bulk superconducting quantum interference device (SQUID) measurements. Nanotube hybrids are initially ferrocene filled single-walled carbon nanotubes (SWCNT) of different metallicities. After a high temperature nanochemical reaction ferrocene molecules react with each other to form iron nano clusters. We show that the ferrocenes molecular orbitals interact differently with the SWCNT of different metallicities without significant XMCD response. This XMCD at various temperatures and magnetic fields reveals that the orbital and/or spin magnetic moments of the encapsulated iron are altered drastically as the transformation to 1D Fe nanoclusters takes place. The orbital and spin magnetic moments are both found to be larger in filled semiconducting nanotubes than in the metallic sample. This could mean that the magnetic polarizations of the encapsulated material is dependent on the metallicity of the tubes. From a comparison between the iron 3d magnetic moments and the bulk magnetism measured by SQUID, we conclude that the delocalized magnetisms dictate the magnetic properties of these 1D hybrid nanostructures.

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