Fe纳米团簇对MgO铁磁薄膜层间交换耦合的剪裁
Tailoring Interlayer Exchange Coupling of Ferromagnetic Films Across MgO with Fe Nanoclusters
摘要：
我们研究了Fe/MgO/Fe和Fe/MgO/Co体系中磁性Fe纳米团簇嵌入MgO间隔层的层间交换耦合。样品生长的分子束外延（MBE），并利用楔形MgO膜独立地改变膜的厚度和位置的Fe纳米团簇。根据Fe纳米团簇的位置，双线性耦合（J1）在幅度上表现出强烈的变化，甚至可以在反铁磁和铁磁之间切换。这种效应是由铁磁薄膜和磁性纳米团簇之间的磁耦合来解释的。有趣的是，Fe纳米团簇与Co膜的耦合比它们与Fe膜的耦合强160%（在MgO间距为0.56 nm处）。这比在类似的薄膜系统（即Fe/MgO/Co对Fe/MgO/Fe）中观察到的20%的耦合差异大得多，识别出与膜和纳米团簇之间的耦合相关的有趣的纳米尺度效应。
英文摘要：
We investigate the interlayer exchange coupling in Fe/MgO/Fe and Fe/MgO/Co systems with magnetic Fe nanoclusters embedded in the MgO spacer. Samples are grown by molecular beam epitaxy (MBE) and utilize wedged MgO films to independently vary the film thickness and the position of the Fe nanoclusters. Depending on the position of the Fe nanoclusters, the bilinear coupling (J1) exhibits strong variations in magnitude and can even switch between antiferromagnetic and ferromagnetic. This effect is explained by the magnetic coupling between the ferromagnetic films and the magnetic nanoclusters. Interestingly, the coupling of Fe nanoclusters to a Co film is 160% stronger than their coupling to a Fe film (at MgO spacing of 0.56 nm). This is much greater than the coupling difference of 20% observed in the analogous thin film systems (i.e. Fe/MgO/Co vs. Fe/MgO/Fe), identifying an interesting nano-scaling effect related to the coupling between films and nanoclusters.
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