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arXiv 1703.08752cond-mat.mtrl-sci
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YIG薄膜的结构和磁性深度依赖性

Unexpected structural and magnetic depth dependence of YIG thin films

J. F. K. Cooper, C. J. Kinane, S. Langridge, M. Ali, B. J. Hickey, T. Niizeki, K. Uchida, E. Saitoh, H. Ambaye, A. Glavic

摘要:

我们报告测量钇铁石榴石(YIG)薄膜生长在钆镓石榴石(GGG)和钇铝石榴石(YAG)衬底上,有和没有薄的Pt顶层。我们提供了三个主要的结果:在Pt/YIG界面的界面区域的观察,我们把一个限制的Pt层的感生磁性,并确认在GGG/YIG界面的界面层的存在。极化中子反射仪(PNR)被用来给深度依赖的结构和磁性的这些结构。我们发现,一个薄膜的钇铁石榴石上GGG是最好的描述由三个不同的层:界面层附近的GGG,约5纳米厚和非磁性,磁性体相,和非磁性和成分不同的薄层附近的表面。我们推测,底层,这是独立的膜厚度,是由Gd扩散。顶层在反自旋霍尔效应测量中可能是极其重要的,并且最可能是Y2 O3或非常类似的。在PNR中的任何感应力矩的Pt的磁灵敏度增加的Y2 O3层的存在下,任何时刻被发现是小于0.02 uB/原子。

英文摘要:

We report measurements on yttrium iron garnet (YIG) thin films grown on both gadolinium gallium garnet (GGG) and yttrium aluminium garnet (YAG) substrates, with and without thin Pt top layers. We provide three principal results: the observation of an interfacial region at the Pt/YIG interface, we place a limit on the induced magnetism of the Pt layer and confirm the existence of an interfacial layer at the GGG/YIG interface. Polarised neutron reflectometry (PNR) was used to give depth dependence of both the structure and magnetism of these structures. We find that a thin film of YIG on GGG is best described by three distinct layers: an interfacial layer near the GGG, around 5 nm thick and non-magnetic, a magnetic bulk phase, and a non-magnetic and compositionally distinct thin layer near the surface. We theorise that the bottom layer, which is independent of the film thickness, is caused by Gd diffusion. The top layer is likely to be extremely important in inverse spin Hall effect measurements, and is most likely Y2O3 or very similar. Magnetic sensitivity in the PNR to any induced moment in the Pt is increased by the existence of the Y2O3 layer; any moment is found to be less than 0.02 uB/atom.

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