Self-Organized Growth, Structure, and Magnetism of Monatomic Transition-Metal Oxide Chains.
Self-Organized Growth, Structure, and Magnetism of Monatomic Transition-Metal Oxide Chains.
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DOI：
10.1103/physrevlett.117.046101
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发表时间：
2016-07
影响因子：
8.6
通讯作者：
P. Ferstl;L. Hammer;Christopher Sobel;M. Gubo;K. Heinz;M. A. Schneider;F. Mittendorfer;J. Redinger
中科院分区：
文献类型：
--
作者：
P. Ferstl;L. Hammer;Christopher Sobel;M. Gubo;K. Heinz;M. A. Schneider;F. Mittendorfer;J. Redinger
本文报道了具有（3×1）周期性和反常MO_{2}化学计量比（M=Ni，Co，Fe，Mn）的过渡金属氧化物单原子链在Ir（100）表面的自组织生长。我们通过定量的LEED，STM和密度泛函理论（DFT）计算来分析它们的结构和磁性。LEED分析揭示了一个迷人的共同原子结构，其中过渡金属原子位于表面的缺失行结构之上，仅通过氧原子与衬底耦合。该结构通过DFT计算证实，结构参数偏离小于1.7 μ m。计算结果表明，NiO 2链是顺磁性的，CoO 2链是铁磁性的，而FeO 2和MnO 2链是反铁磁性的。所有的结构只显示出弱的磁链间耦合。此外，我们证明了在Ir（100）上的Co和Ni或Fe的二元合金的氧化物链的生长，这使我们能够产生由非铁磁或反铁磁段分离的不同长度的铁磁链的良好控制的集合。
We report on the self-organized growth of monatomic transition-metal oxide chains of (3×1) periodicity and unusual MO_{2} stoichiometry (M=Ni, Co, Fe, Mn) on Ir(100). We analyze their structural and magnetic properties by means of quantitative LEED, STM, and density functional theory (DFT) calculations. LEED analyses reveal a fascinating common atomic structure in which the transition-metal atoms sit above a missing-row structure of the surface and are coupled to the substrate only via oxygen atoms. This structure is confirmed by DFT calculations with structural parameters deviating by less than 1.7 pm. The DFT calculations predict that the NiO_{2} chains are nonmagnetic, CoO_{2} chains are ferromagnetic, while FeO_{2} and MnO_{2} are antiferromagnetic. All structures show only weak magnetic interchain coupling. Further, we demonstrate the growth of oxide chains of binary alloys of Co and Ni or Fe on Ir(100), which allows us to produce well-controlled ensembles of ferromagnetic chains of different lengths separated by nonmagnetic or antiferromagnetic segments.