Understanding the kinetics of Fe subsurface dissolution and surface segregation upon annealing Fe on Pd(111) in vacuum/oxygen environment

Yan, Yinfei; Zhong, Fengmin; Lian, Songyou; Wang, Zumin; Wang, J.Y.; Xu, Congkang

doi:10.1007/s00339-022-05269-7

Cited by 3 publications

(1 citation statement)

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“…It can be observed that the fractions of the L1 2 and A1 phases decrease with increasing annealing time, while the fractions of the L1′ and A6 phases increase. The L1 2 FePd 3 phase is known to preferentially form at the Fe/Pd interface during annealing. , Additionally, the diffusion coefficients of the fcc FePd system are highest for Pd concentration around 60–70%, indicating the shift of the congruent point and preferential formation of an alloy with FePd 3 stoichiometry at the early stages of annealing. Indeed, the CEMS results for S_ML demonstrated the presence of a palladium-rich A1 phase, while the L1 2 phase shows the highest contribution to the spectra for the shortest annealing times, followed by a rapid decrease in concentration with longer annealing times.…”

Section: Results and Discussionmentioning

confidence: 99%

Tracking of the Multimodal Ordering Process in FePd Alloy

Zarzycki,

Perzanowski,

Krupinski

et al. 2024

J. Phys. Chem. C

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This work presents the process of phase transformation and chemical ordering in an FePd alloy thin film. The study focuses on a multilayered Fe/Pd system undergoing a postdeposition annealing process. The annealing induces morphological and structural changes in the samples, which were observed by using scanning electron microscopy, X-ray reflectivity, and conversion electron Mossbauer spectroscopy. The microscopic structural properties were examined at various stages of annealing to track the progress of the chemical ordering and transformation. Our findings reveal that the transformation to the L1 0 phase occurs through a multiphase process with two distinct paths: first, with stoichiometric (A1−A6), and second, off-stoichiometric (L1 2 -L1′) intermediate phases. Both paths start with cubic fcc structures that undergo tetragonal distortion and successive chemical ordering to the L1 0 phase. The observed increase in transformation effectiveness correlates well with the surface diffusion-induced dewetting phenomenon and a change in the kinetic phase growth process from a low-dimensional to a three-dimensional growth mechanism. These phenomena primarily affect the growth of the L1 0 phase, which is particularly interesting for material science, spintronics, and sensorics. The use of conversion electron Mossbauer spectroscopy allows us to study of these effects at an atomic level not accessible by other techniques.

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Section: Results and Discussionmentioning

confidence: 99%