Giant antiferromagnetic exchange coupling in ultrahigh-vacuum grown (111) Co/Rh sandwiches
Giant antiferromagnetic exchange coupling in ultrahigh-vacuum grown (111) Co/Rh sandwiches
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超高真空生长 (111) Co/Rh 三明治中的巨型反铁磁交换耦合
DOI：
10.1016/s0304-8853(96)00586-0
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发表时间：
1997
影响因子：
2.7
通讯作者：
H. Rakoto
中科院分区：
文献类型：
--
作者：
S. Zoll;A. Dinia;M. Gester;D. Stoeffler;H. Berg;A. Herr;R. Poinsot;H. Rakoto
本文研究了用超高真空蒸发法在云母衬底上生长的Co/Rh/Co三明治结构的交换耦合。在这些夹层中，Co和Rh层都具有（111）fcc结构，如在生长期间观察到的RHEED图案所示。观察到振荡的间接交换耦合和磁电阻随Rh厚度的变化。最有趣的结果是在薄的Rh空间层中达到了非常强的反铁磁交换耦合：对于4.8 μ Rh，达到了34 erg/cm 2。我们将这一结果部分归因于磁化强度测量所示的磁性/非磁性界面的性质。事实上，没有减少的CO时刻被发现这些三明治虽然是一个大的相互扩散，预计在他们的界面。这证实了从头计算的磁化强度与混合界面。这种界面的磁性应该有利于空间层中的电子约束。
A study of the exchange coupling of Co/Rh/Co sandwiches grown by ultrahigh-vacuum evaporation on mica substrata is presented. In these sandwiches, both Co and Rh layers have a (111) fcc structure, as indicated by the RHEED pattern observed during growth. Oscillatory indirect exchange coupling and magnetoresistance as a function of the Rh thickness a observed. The most interesting result is the very strong antiferromagnetic exchange coupling reached for thin Rh space layers: 34 erg/cm2for 4.8 Å Rh. We attribute this result partly to the nature of the magnetic/non-magnetic interfaces shown by magnetisation measurements. Indeed, no reduction in the Co moment is found for these sandwiches although the is a large interdiffusion is expected at their interfaces. This is confirmed by ab initio calculations of the magnetisation with mixed interfaces. Such a magnetic nature of the interfaces should be favourable for electronic confinement in the space layer.