嵌入碳纳米管中的镍簇作为高性能磁体。

Nickel clusters embedded in carbon nanotubes as high performance magnets.

作者信息

Shiozawa Hidetsugu, Briones-Leon Antonio, Domanov Oleg, Zechner Georg, Sato Yuta, Suenaga Kazu, Saito Takeshi, Eisterer Michael, Weschke Eugen, Lang Wolfgang, Peterlik Herwig, Pichler Thomas

机构信息

Faculty of Physics, University of Vienna, Boltzmanngasse 5, 1090 Vienna, Austria.

Nanomaterials Research Institute, AIST, 1-1-1 Higashi, Tsukuba 305-8565, Japan.

出版信息

Sci Rep. 2015 Oct 13;5:15033. doi: 10.1038/srep15033.

DOI:10.1038/srep15033

PMID:26459370

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC4602218/

Abstract

Ensembles of fcc nickel nanowires have been synthesized with defined mean sizes in the interior of single-wall carbon nanotubes. The method allows the intrinsic nature of single-domain magnets to emerge with large coercivity as their size becomes as small as the exchange length of nickel. By means of X-ray magnetic circular dichroism we probe electronic interactions at nickel-carbon interfaces where nickel exhibit no hysteresis and size-dependent spin magnetic moment. A manifestation of the interacting two subsystems on a bulk scale is traced in the nanotube's magnetoresistance as explained within the framework of weak localization.

摘要

已在单壁碳纳米管内部合成了具有确定平均尺寸的面心立方镍纳米线集合体。该方法使得单畴磁体的内在特性得以显现，随着其尺寸小至镍的交换长度，矫顽力增大。通过X射线磁圆二色性，我们探测了镍 - 碳界面处的电子相互作用，在该界面处镍没有磁滞现象且自旋磁矩与尺寸有关。如在弱局域化框架内所解释的那样，在纳米管的磁电阻中可以追溯到这两个相互作用子系统在宏观尺度上的一种表现。