Anomalously large intermixing in aluminum–transition-metal bilayers

Buchanan, James D. R.; Hase, Thomas P. A.; Tanner, B. K.; Chen, P J.; Gan, L; Powell, Cedric J.; Egelhoff, William F.

doi:10.1103/physrevb.66.104427

Cited by 59 publications

(51 citation statements)

References 18 publications

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“…The deposition of 1 ML of Pt leads to the formation of an adlayer rich in Al in agreement with the experimental findings 8,35 . The available room temperature experimental results also report us strong intermixing for Pt/Al 8,35 . The computer animation of the atomic injection can be seen in a web page 54 .…”

Section: Transient Inter-layer Atomic Mixing (Tilam)supporting

confidence: 80%

“…Many experimental results support indirectly our finding. Strong exothermic solid state reactions have long been known between various metals and Al 8,35,50 .…”

Section: Transient Inter-layer Atomic Mixing (Tilam)mentioning

confidence: 99%

“…Recently it has been shown by MD studies in accordance with experimental results that under externally forced conditions, transient enhanced intermixing of heavier impurities could occur in bulk materials 17,18 . In the absence of considerable external load of perturbation, such as during atomic deposition ultrafast intermixing and surface alloying can also be induced 7,8,19,20,21 . Moreover, the most recently it has also been found that the bulk mobility of atomic metallic clusters could also be enhanced leading to ballistic burrowing in Al and in Ti 22 .…”

Section: Introductionmentioning

confidence: 99%

“…Also, concerted atomic transport processes during self-organization such as adatom nucleation via detechment and attachment processes at step edges and thin film growth and processing, however, often lead to abrupt surface alloying and intermixing 5,6,7,8 . These processes proceed via atomic site exchanges within the topmost atomic layer 9,10,11,12 .…”

Section: Introductionmentioning

confidence: 99%

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Self-organized transient facilitated atomic transport in Pt∕Al(111)

Süle

2008

The Journal of Chemical Physics

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During the course of atomic transport in a host material, impurity atoms need to surmount an energy barrier driven by thermodynamic bias or at ultra-low temperatures by quantum tunneling. In the present article we demonstrate using atomistic simulations that at ultra-low temperature transient inter-layer atomic transport is also possible without tunneling when the Pt/Al(111) impurity/host system self-organizes itself spontaneously into an intermixed configuration. No such extremely fast athermal concerted process has been reported before at ultra low temperatures. The outlined novel transient atomic exchange mechanism could be of general validity. We find that the source of ultra-low temperature heavy particle barrier crossing is intrinsic and no external bias is necessary for atomic intermixing and surface alloying in Pt/Al although the dynamic barrier height is few eV. The mechanism is driven by the local thermalization of the Al(111) surface in a selforganized manner arranged spontaneously by the system without any external stimulus. The core of the short lived thermalized region reaches the local temperature of ∼ 1000 K (including few tens of Al atoms) while the average temperature of the simulation cell is ∼ 3 K. The transient facilitated intermixing process also takes place with repulsive impurity-host interaction potential leading to negative atomic mobility hence the atomic injection is largely independent of the strength of the impurity-surface interaction. We predict that similar exotic behaviour is possible in other materials as well.

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Section: Transient Inter-layer Atomic Mixing (Tilam)supporting

confidence: 80%

“…Many experimental results support indirectly our finding. Strong exothermic solid state reactions have long been known between various metals and Al 8,35,50 .…”

Section: Transient Inter-layer Atomic Mixing (Tilam)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Self-organized transient facilitated atomic transport in Pt∕Al(111)

Süle

2008

The Journal of Chemical Physics

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“…The Fe-Al system is selected for this purpose since the largely different chemical mixing at the top and the bottom interface has been established by different experimental methods. [2][3][4] The interface mixing in Fe-Al multilayers has been studied intensively by MS, [5][6][7][8][9][10] as well, and due to the outstanding properties of the alloy system for industrial applications, the M€ ossbauer parameters of the different alloy phases and the dependence of the hyperfine fields (HFs) on the number of Al neighbors in the bcc phase are well studied. 8 MD simulations have already been performed for the Fe(001)/Al (Al on top of Fe) and Al(001)/Fe (Fe on top of Al) interfaces, 11,12 and these indeed show an asymmetry of the top and bottom Fe interfaces.…”

Section: Introductionmentioning

confidence: 99%