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Akademický článek

Efficient orbital imaging based on ultrafast momentum microscopy and sparsity-driven phase retrieval

Autor: G S M Jansen, M Keunecke, M Düvel, C Möller, D Schmitt, W Bennecke, F J S Kappert, D Steil, D R Luke, S Steil, S Mathias

Publikováno v: New Journal of Physics, Vol 22, Iss 6, p 063012 (2020)

We present energy-resolved photoelectron momentum maps for orbital tomography that have been collected with a novel and efficient time-of-flight momentum microscopy setup. This setup is combined with a 0.5 MHz table-top femtosecond extreme-ultraviole

Externí odkaz: https://doaj.org/article/e69bbc2533cb400cbef1bbd6e890a08e

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Time-resolved Photoelectron Momentum Microscopy using a 1 MHz High-Harmonic Generation Beamline

Autor: Daniel Steil, Christina Möller, G. S. Matthijs Jansen, Sabine Steil, David Schmitt, Wiebke Bennecke, Marcel Reutzel, M. Keunecke, Stefan Mathias

Publikováno v: 2021 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC).

In the last decades, high-harmonic generation (HHG) has rapidly developed from an experimental novelty into a workhorse of laboratory-based ultrafast physics research. In the field of photoelectron spectroscopy, extreme ultraviolet light from HHG is

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::6dadb6515ca93b0303257b130d1b4f29
https://doi.org/10.1109/cleo/europe-eqec52157.2021.9542197

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Electron irradiation induced modifications of Ti(1-x)AlxN coatings and related buffer layers on steel substrates

Autor: Lars Hultman, Jun Lu, Jan Petersen, Gundis Grumbt, K. Bewilogua, Kai Weigel, M. Keunecke, Rolf Zenker

Ti(1-x)AlxN hard coatings were prepared by reactive magnetron sputtering onto steel substrates (51CrV4 – 1.8159) and subsequently exposed for a short-time (~1 s) to high-flux electron beam (EB) treatment. Morphology, composition and the structure o

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::07d8c2d12f6698ac57fe43f9171b798c
https://publica.fraunhofer.de/handle/publica/265836

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Reduction of adhesive wear with use of tool coating reducing thermoelectric currents

Autor: A Schrepfer, A Schott, P Tröber, M Keunecke, M Welm, F Steinlehner, R Golle, W Volk

Publikováno v: IOP Conference Series: Materials Science and Engineering. 1238:012033

Blanking is one of the main processes in producing sheet metal components. The impact of adhesive wear of the blanking tools on the cost efficiency is high, especially when processing aluminum. As an influencing factor on adhesive wear in blanking, t

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::89ee7b40d30cd4dcd934595a72a65242
https://doi.org/10.1088/1757-899x/1238/1/012033

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Electromagnetic dressing of the electron energy spectrum of Au(111) at high momenta

Autor: G. S. Matthijs Jansen, Stefan Kehrein, David Schmitt, Christina Möller, M. Keunecke, Stefan Mathias, Sabine Steil, Tridev Mishra, Alexander Osterkorn, Daniel Steil, Marcel Reutzel, Wiebke Bennecke, Salvatore R. Manmana

Publikováno v: Physical Review B. 102

Light-engineering of quantum materials via electromagnetic dressing is considered an on-demand approach for tailoring electronic band dispersions and even inducing topological phase transitions. For probing such dressed bands, photoemission spectrosc

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::dbab4ca808617ea8a7493d49bea712ff
https://doi.org/10.1103/physrevb.102.161403

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Time-Resolved Momentum Microscopy with a 1 MHz High-Harmonic Extreme Ultraviolet Beamline

Autor: Christina Möller, Daniel Steil, Hendrik Nolte, M. Keunecke, David Schmitt, Marcel Reutzel, Sabine Steil, Gyula Halasi, Marie Gutberlet, G. S. Matthijs Jansen, Stefan Mathias

Recent progress in laser-based high-repetition rate extreme ultraviolet (EUV) lightsources and multidimensional photoelectron spectroscopy enable the build-up of a new generation of time-resolved photoemission experiments. Here, we present a setup fo

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6579b2edf718ba864851d81eeb89ead8
http://arxiv.org/abs/2003.01602

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Mechanical and structural properties of multilayer c-BN coatings on cemented carbide cutting tools

Autor: Jeon-Geon Han, Kwangmin Lee, Sung-Tae Park, M. Keunecke

Publikováno v: International Journal of Refractory Metals and Hard Materials. 65:52-56

Multilayer cubic boron nitride (c-BN) coatings represent a new deposition method that can improve adhesion on metal substrates. The multilayer c-BN system in this study consisted of a TiAlN interlayer (2– 3.5 μm), boron carbide (~ 1 μm), and a c-

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::4901a61ece1249fbae30394e8ea9b43e
https://doi.org/10.1016/j.ijrmhm.2016.11.009

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High-T_{c}$ interfacial ferromagnetism in SrMnO_{3}/LaMnO_{3}$ superlattices

Autor: F. Lyzwa, Knut Müller-Caspary, Nicolas Gauquelin, Frank Klose, Vasily Moshnyaga, Johann Verbeeck, M. Keunecke, Vladimir Roddatis, Danny Schwarzbach, M. Jungbauer, Sara J. Callori

Publikováno v: Advanced functional materials
Advanced functional materials 30(18), 1808270 (2020). doi:10.1002/adfm.201808270
Advanced Functional Materials

Heterostructures of strongly correlated oxides demonstrate various intriguing and potentially useful interfacial phenomena. LaMnO3/SrMnO3 superlattices are presented showcasing a new high-temperature ferromagnetic phase with Curie temperature, TC≈3

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::aceb87a145d46457b21fa2624b56ff77
https://hdl.handle.net/10067/1621080151162165141

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