Regensburg 2013 – wissenschaftliches Programm

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DS: Fachverband Dünne Schichten

DS 13: Poster Session III: Layer properties: electrical, optical and mechanical properties; Thin film characterization: structure analysis and composition (XRD, TEM; XPS, SIMS, RBS..)

DS 13.21: Poster

Montag, 11. März 2013, 17:00–20:00, Poster B1

Direct observation of deuterium-dead layer in Fe/V multilayers by atom probe tomography — •Ryota Gemma^1,2, Talaat Al-Kassab², Reiner Kirchheim¹, and Astrid Pundt¹ — ¹Institute of Materials Physics, University of Göttingen, Friedrich-Hund-Platz 1, D-37077 Göttingen, Germany — ²Physical Science and Engineering Division, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Kingdom of Saudi Arabia

Atom probe tomography (APT) is nowadays regarded as one of the promising tools to analyze hydrogen or deuterium (D) distributions on the atomic scale. At metallic hetero-interfaces, it has been suggested that a nanometer thin hydrogen-dead layer (DL) appears due to an interface charge transfer and/or to an elastic discontinuity. With focus on such an interface effect, we investigated the local deuterium distribution in multilayered thin Fe/V films by APT. More recently, we have succeeded to observe DL by APT. In this contribution, we report on detailed studies on DL: The DL in Fe/V multilayers can be successfully separated from an interface mixing effect. The observed DL thickness commonly ranges from 0.4 to 0.5 nm, showing an excellent agreement with the previously suggested DL thickness. But, the DL is found to disappear at high deuterium concentrations above 0.1 D/Metal. This is considered to originate from occupation of high energy interstitial sites by D atoms, at the interface. A sloped plateau region as found in the corresponding p-c-T diagram, supports this interpretation. Financial support by the DFG via project PU131/9 is gratefully acknowledged.