Diffusion-driven L10 FePt phase formation in Fe/Ag(Au)/Pt and Pt/Ag(Au)/Fe trilayers with inverted layer stacking

G.L. Katona , P.V. Makushko , N.Y. Schmidt , O. Lik , T.I. Verbytska , G. Beddies , D.L. Beke , M. Albrecht , Yu.M. Makogon
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引用次数: 0

Abstract

In this work the diffusion-induced formation of an ordered L10 FePt phase in Fe(15 nm)/Ag(Au)(10 nm)/Pt(15 nm) and Pt(15 nm)/Ag(Au)/Fe(15 nm) trilayers with a Ag(Au) interlayer upon annealing is studied. The films were prepared by magnetron sputtering on SiO2/Si(001) substrates. Isothermal annealing of the samples was carried out in vacuum at 700°С for different annealing times up to 30 min. It was found that the stacking sequence of the trilayer has a strong impact on the direction of the diffusion process. This results in the formation of different chemical composition along the film thickness which is explained by the different formation enthalpies of possible phases. Finally, the hard magnetic L10 FePt phase is formed with grain boundaries filled by Ag(Au) resulting in enhanced coercivity. In addition, depending on the layer stacking sequence, the remaining Ag(Au) can be found either on the top surface or at the substrate interface. In this regard, employing different diffusion paths on selected layer stacks is a promising approach of forming gradient nanomaterials with properties that might be useful for practical applications.
Fe/Ag(Au)/Pt和Pt/Ag(Au)/Fe三层中L10 FePt相形成的扩散驱动
本文研究了Fe(15nm)/Ag(Au)(10nm)/Pt(15nm)和Pt(15nm)/Ag(Au)/Fe(15nm)三层中Ag(Au)中间层退火后扩散诱导有序L10 FePt相的形成。采用磁控溅射技术在SiO2/Si(001)衬底上制备薄膜。在700°С真空中对样品进行等温退火,退火时间最长为30 min。发现三层的堆叠顺序对扩散过程的方向有很强的影响。这导致沿膜厚度形成不同的化学成分,这可以用可能相的不同形成焓来解释。最后形成硬磁L10 FePt相,晶界被Ag(Au)填充,矫顽力增强。此外,根据层的堆叠顺序,剩余的Ag(Au)可以在顶部表面或衬底界面上找到。在这方面,在选定的层堆栈上采用不同的扩散路径是形成具有实际应用可能有用的特性的梯度纳米材料的有前途的方法。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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CiteScore
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