Substrate-induced magnetic ordering and switching of iron porphyrin molecules
Substrate-induced magnetic ordering and switching of iron porphyrin molecules
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DOI：
10.1038/nmat1932
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发表时间：
2007-07-01
期刊：
影响因子：
41.2
通讯作者：
Eriksson, O.
中科院分区：
文献类型：
--
作者：
Wende, H.;Bernien, M.;Eriksson, O.
为了实现分子自旋电子器件，从外部控制分子磁体的磁化强度是非常重要的。一类特别有希望作为分子电子器件构建块的材料是与金属衬底接触的顺磁性卟啉分子。本文研究了原位升华铁卟啉分子在Cu（100）上的Ni和Co铁磁膜上的结构取向和磁耦合。我们的研究包括x射线吸收光谱和x射线磁圆二色性实验。在一项结合实验和计算的研究中，我们证明了由于分子中的铁原子与底物（Co或Ni）中的原子之间的间接超交换相互作用，顺磁性分子可以被制成铁磁有序。铁磁矩可以沿平面方向旋转，也可以通过基材的磁化反转，从而为自旋依赖的分子电子学开辟了一条途径。
To realize molecular spintronic devices, it is important to externally control the magnetization of a molecular magnet. One class of materials particularly promising as building blocks for molecular electronic devices is the paramagnetic porphyrin molecule in contact with a metallic substrate. Here, we study the structural orientation and the magnetic coupling of in-situ-sublimated Fe porphyrin molecules on ferromagnetic Ni and Co films on Cu(100). Our studies involve X-ray absorption spectroscopy and X-ray magnetic circular dichroism experiments. In a combined experimental and computational study we demonstrate that owing to an indirect, superexchange interaction between Fe atoms in the molecules and atoms in the substrate (Co or Ni) the paramagnetic molecules can be made to order ferromagnetically. The Fe magnetic moment can be rotated along directions in plane as well as out of plane by a magnetization reversal of the substrate, thereby opening up an avenue for spin-dependent molecular electronics.