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首页> 外文期刊>Journal of Physics, D. Applied Physics: A Europhysics Journal >Low-temperature formation of the FePt phase in the presence of an intermediate Au layer in Pt/Au/Fe thin films
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Low-temperature formation of the FePt phase in the presence of an intermediate Au layer in Pt/Au/Fe thin films

机译：在Pt / Au / Fe薄膜中存在中间Au层时，FePt相的低温形成

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摘要

Pt/Fe and Pt/Au/Fe layered films were deposited at room temperature by dc magnetron sputtering on Al2O3(0001) single crystalline substrates and heat treated in vacuum at 330 degrees C with different durations (up to 62 h). It is shown by secondary neutral mass spectrometry depth profiling and x-ray diffraction that the introduction of an additional Au layer between Pt/Fe layers leads to enhanced intermixing and formation of the partially chemically ordered L1(0) FePt phase. The underlying diffusion processes can be explained by the grain boundary diffusion induced reaction layer formation mechanism. During the solid state reaction between Pt and Fe, the Au layer moves towards the substrate interface replacing the Fe layer. This was explained by the much faster diffusion of Fe, as compared to Pt, along the grain boundaries in Au. Enhancement of the process and formation of the ordered FePt phase in the presence of the Au intermediate layer were interpreted by the effect of stress accumulation during the grain boundary reactions: the disordered FePt phase formed initially at different Au and Pt grain boundaries can experience appropriate compressive stress along the {100} directions, which can initiate the formation of the chemically ordered L1(0) FePt phase.
机译：在室温下，通过直流磁控溅射将Pt / Fe和Pt / Au / Fe层状膜沉积在Al2O3（0001）单晶衬底上，并在330摄氏度的真空中以不同的持续时间（长达62小时）进行热处理。二次中性质谱深度剖析和X射线衍射表明，在Pt / Fe层之间引入额外的Au层会导致增强的混合和部分化学有序的L1（0）FePt相的形成。潜在的扩散过程可以通过晶界扩散诱导的反应层形成机理来解释。在Pt和Fe之间的固态反应期间，Au层向衬底界面移动，从而取代了Fe层。与Pt相比，Fe沿Au的晶界扩散更快，可以解释这一点。晶界反应过程中应力累积的影响解释了在Au中间层存在下过程和有序FePt相形成的增强：最初在不同的Au和Pt晶界形成的无序FePt相可以经历适当的压缩沿{100}方向的应力，可以启动化学有序的L1（0）FePt相的形成。

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