Ordered surface alloy of bulk-immiscible components stabilized by magnetism.
Ordered surface alloy of bulk-immiscible components stabilized by magnetism.
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通过磁性稳定的块状不混溶成分的有序表面合金。
DOI：
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发表时间：
2010
影响因子：
8.6
通讯作者：
S. Narasimhan
中科院分区：
文献类型：
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作者：
S. Mehendale;Y. Girard;V. Repain;C. Chacon;J. Lagoute;S. Rousset;M. Marathe;S. Narasimhan
使用扫描隧道显微镜和衍射实验，我们发现了一种新的有序表面合金，由沉积在 Ru(0001) 基底上的两种块体不混溶成分 Fe 和 Au 制成。在这样的系统中，基质介导的应变相互作用被认为提供了混合的主要驱动力。然而，自旋极化从头计算表明，最稳定的结构始终是每个 Fe 原子具有最高磁矩的结构，而不是最小化表面应力的结构，这与观察结果非常一致。这为创造具有与设备应用相关的独特性能的材料开辟了新的可能性。
Using scanning tunneling microscopy and a diffraction experiment, we have discovered a new ordered surface alloy made out of two bulk-immiscible components, Fe and Au, deposited on a Ru(0001) substrate. In such a system, substrate-mediated strain interactions are believed to provide the main driving force for mixing. However, spin-polarized ab initio calculations show that the most stable structures are always the ones with the highest magnetic moment per Fe atom and not the ones minimizing the surface stress, in remarkable agreement with the observations. This opens up novel possibilities for creating materials with unique properties of relevance to device applications.