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Interface alloying effects in the magnetic properties of Fe nanoislands capped with different materials

机译:界面合金化对不同材料包覆的铁纳米岛磁性能的影响

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摘要

We show that Fe nanoislands capped with Al, Pd, and Pt protecting layers include an alloy at the interface with the capping layer, which explains the previously known capping layer dependence on the interparticle magnetic coupling. Vibrating sample magnetometry results, for instance, are evidencing a reduction in the magnetization measured under a magnetic field of 15 mT, which is larger in the case of the Al capping and which is due to the presence of a magnetically dead interface alloy. This reduction is also observed at the atomic level using x-ray magnetic circular dichroism measurements, showing a capping layer dependence of the Fe magnetic-moment reduction that is similar for the Pd and Pt capping, and stronger for the Al capping. The trend in the magnetic properties as a function of the capping layer is explained in the light of x-ray photoemission spectroscopy results that evidence the formation of alloys at the interface between the Fe nanoislands and the capping layers. The present results highlight the strong influence of interface alloying in systems of reduced dimensionality. In particular, it is shown that the magnetic properties are strongly affected at both the atomic and macroscopic level.
机译:我们显示,被Al,Pd和Pt保护层覆盖的Fe纳米岛在与覆盖层的界面处包含合金,这解释了先前已知的覆盖层对粒子间磁耦合的依赖性。例如,振动样品的磁力测定结果表明,在15 mT的磁场下测得的磁化强度降低,这在Al封盖的情况下更大,并且归因于存在磁死界面合金。使用X射线磁性圆二色性测量还可以在原子水平上观察到这种减少,表明Fe磁矩减少的覆盖层依赖性与Pd和Pt覆盖相似,而Al覆盖则更强。根据x射线光发射光谱学的结果解释了磁性性质作为覆盖层的函数的趋势,该结果证明了在铁纳米岛和覆盖层之间的界面处形成了合金。目前的结果强调了界面合金化在降低尺寸系统中的强大影响。特别地,显示出在原子和宏观水平上都强烈影响磁性。

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