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  1. AU="Gross, Boris"
  2. AU="Perkins, George H"
  3. AU="Jormanainen, J"
  4. AU="Pichardo-González, Priamo A"
  5. AU="Cannegieter, Suzanne"
  6. AU="Trocino, Giuseppe"
  7. AU="Emiliano, Thais Moura"
  8. AU=Sinelli Mariateresa
  9. AU="De-guo LÜ"
  10. AU="Benoit-Pilven, Clara"
  11. AU="Lanza, Stefania"
  12. AU="Chilingarian, A"
  13. AU="Baldovini, Nicolas"
  14. AU="López Rodríguez, David"
  15. AU="Alexander König"
  16. AU="Jakobsen, Henrik L"
  17. AU="Yong-Zhao Dai"
  18. AU="Tara L. Pukala"
  19. AU="Addo‐Danso, Shalom D."
  20. AU=Ficheux Q.
  21. AU="Tomoyo Sawada"
  22. AU="Mohammad Kawsar Sharif Siam"
  23. AU=Kushnareva Yulia
  24. AU="Canova, Christopher T"
  25. AU="Hasnaoui, Naoual"
  26. AU="Maradana, Jhansi"
  27. AU="Raggini, Elisa"
  28. AU="Baxter, A."
  29. AU="Jackson, Shirnae"
  30. AU="Schenzle, Lisa"
  31. AU="Veronica Phillips"
  32. AU="Braun, Jörg"
  33. AU="Cassandra E. Holbert"
  34. AU="Trevisan Alexandra"

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  1. Artikel ; Online: Scanning Nitrogen-Vacancy Magnetometry of Focused-Electron-Beam-Deposited Cobalt Nanomagnets.

    Žaper, Liza / Rickhaus, Peter / Wyss, Marcus / Gross, Boris / Wagner, Kai / Poggio, Martino / Braakman, Floris

    ACS applied nano materials

    2024  Band 7, Heft 4, Seite(n) 3854–3860

    Abstract: Focused-electron-beam-induced deposition is a promising technique for patterning nanomagnets in a single step. We fabricate cobalt nanomagnets in such a process and characterize their content, saturation magnetization, and stray magnetic field profiles ... ...

    Abstract Focused-electron-beam-induced deposition is a promising technique for patterning nanomagnets in a single step. We fabricate cobalt nanomagnets in such a process and characterize their content, saturation magnetization, and stray magnetic field profiles by using a combination of transmission electron microscopy and scanning nitrogen-vacancy (NV) magnetometry. We find agreement between the measured stray field profiles and saturation magnetization with micromagnetic simulations. We further characterize magnetic domains and grainy stray magnetic fields in the nanomagnets and their halo side-deposits. This work may aid in the evaluation of Co nanomagnets produced through focused electron-beam-induced deposition for applications in spin qubits, magnetic field sensing, and magnetic logic.
    Sprache Englisch
    Erscheinungsdatum 2024-02-07
    Erscheinungsland United States
    Dokumenttyp Journal Article
    ISSN 2574-0970
    ISSN (online) 2574-0970
    DOI 10.1021/acsanm.3c05470
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

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  2. Buch ; Online: Scanning NV magnetometry of focused-electron-beam-deposited cobalt nanomagnets

    Žaper, Liza / Rickhaus, Peter / Wyss, Marcus / Gross, Boris / Poggio, Martino / Braakman, Floris

    2023  

    Abstract: Focused-electron-beam-induced deposition is a promising technique for patterning nanomagnets for spin qubit control in a single step. We fabricate cobalt nanomagnets in such a process, obtaining cobalt contents and saturation magnetizations comparable to ...

    Abstract Focused-electron-beam-induced deposition is a promising technique for patterning nanomagnets for spin qubit control in a single step. We fabricate cobalt nanomagnets in such a process, obtaining cobalt contents and saturation magnetizations comparable to or higher than those typically obtained using electron-beam lithography. We characterize the nanomagnets using transmission electron microscopy and image their stray magnetic field using scanning NV magnetometry, finding good agreement with micromagnetic simulations. The magnetometry reveals the presence of magnetic domains and halo side-deposits, which are common for this fabrication technique. Finally, we estimate dephasing times for electron spin qubits in the presence of disordered stray fields due to these side-deposits.
    Schlagwörter Condensed Matter - Materials Science ; Quantum Physics
    Erscheinungsdatum 2023-06-11
    Erscheinungsland us
    Dokumenttyp Buch ; Online
    Datenquelle BASE - Bielefeld Academic Search Engine (Lebenswissenschaftliche Auswahl)

    Volltext online

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  3. Buch ; Online: Visualizing thickness-dependent magnetic textures in few-layer $\text{Cr}_2\text{Ge}_2\text{Te}_6$

    Vervelaki, Andriani / Bagani, Kousik / Jetter, Daniel / Doan, Manh-Ha / Chau, Tuan K. / Gross, Boris / Christensen, Dennis / Bøggild, Peter / Poggio, Martino

    2023  

    Abstract: Magnetic ordering in two-dimensional (2D) materials has recently emerged as a promising platform for data storage, computing, and sensing. To advance these developments, it is vital to gain a detailed understanding of how the magnetic order evolves on ... ...

    Abstract Magnetic ordering in two-dimensional (2D) materials has recently emerged as a promising platform for data storage, computing, and sensing. To advance these developments, it is vital to gain a detailed understanding of how the magnetic order evolves on the nanometer-scale as a function of the number of atomic layers and applied magnetic field. Here, we image few-layer $\text{Cr}_2\text{Ge}_2\text{Te}_6$ using a combined scanning superconducting quantum interference device and atomic force microscopy probe. Maps of the material's stray magnetic field as a function of applied magnetic field reveal its magnetization per layer as well as the thickness-dependent magnetic texture. Using a micromagnetic model, we correlate measured stray-field patterns with the underlying magnetization configurations, including labyrinth domains and skyrmionic bubbles. Comparison between real-space images and simulations demonstrates that the layer dependence of the material's magnetic texture is a result of the thickness-dependent balance between crystalline and shape anisotropy. These findings represent an important step towards 2D spintronic devices with engineered spin configurations and controlled dependence on external magnetic fields.

    Comment: 15 pages, 4 figures, and supplementary information
    Schlagwörter Condensed Matter - Mesoscale and Nanoscale Physics ; Condensed Matter - Materials Science
    Thema/Rubrik (Code) 530
    Erscheinungsdatum 2023-11-14
    Erscheinungsland us
    Dokumenttyp Buch ; Online
    Datenquelle BASE - Bielefeld Academic Search Engine (Lebenswissenschaftliche Auswahl)

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  4. Artikel: Reactive Copper Deposition on Au(111) and Mo(001): Role of the Support in the Oxidation Process

    Fedderwitz, Hanna / Groß Boris / Sträter Hendrik / Nilius Niklas

    The Journal of Physical Chemistry C. 2016 Apr. 14, v. 120, no. 14

    2016  

    Abstract: Photoelectron spectroscopy and scanning tunneling microscopy were used to study the oxidation characteristics of Cu atoms deposited on two different supports, Au(111) and Mo(001). While a thin, homogeneous Cu₂O film grows on gold, metallic Cu deposits ... ...

    Abstract Photoelectron spectroscopy and scanning tunneling microscopy were used to study the oxidation characteristics of Cu atoms deposited on two different supports, Au(111) and Mo(001). While a thin, homogeneous Cu₂O film grows on gold, metallic Cu deposits develop on the Mo surface. The difference in the oxidation behavior is discussed in terms of the chemical inertness of the substrates and possible interface interactions. A favorable lattice match stabilizes the Cu₂O film on Au(111). Conversely, a passivating surface oxide develops on Mo(001), inhibiting Cu oxidation and driving the metal into Volmer–Weber growth. Apparently, the more reactive substrate is not the one that promotes oxidation of the precipitated ad-metal.
    Schlagwörter copper ; cuprous oxide ; gold ; molybdenum ; oxidation ; physical chemistry ; scanning tunneling microscopy ; spectroscopy
    Sprache Englisch
    Erscheinungsverlauf 2016-0414
    Umfang p. 7591-7596.
    Erscheinungsort American Chemical Society
    Dokumenttyp Artikel
    ISSN 1932-7455
    DOI 10.1021%2Facs.jpcc.6b00435
    Datenquelle NAL Katalog (AGRICOLA)

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  5. Artikel ; Online: Adsorption of squaraine molecules to Au(111) and Ag(001) surfaces.

    Luft, Maike / Groß, Boris / Schulz, Matthias / Lützen, Arne / Schiek, Manuela / Nilius, Niklas

    The Journal of chemical physics

    2018  Band 148, Heft 7, Seite(n) 74702

    Abstract: The adsorption of anilino squaraines, an important chromophore for the use in organic solar cells, to Ag(001) and Au(111) has been studied with scanning tunneling microscopy. Self-assembly into square building blocks with eight molecules per unit cell is ...

    Abstract The adsorption of anilino squaraines, an important chromophore for the use in organic solar cells, to Ag(001) and Au(111) has been studied with scanning tunneling microscopy. Self-assembly into square building blocks with eight molecules per unit cell is revealed on the Ag surface, while no ordering effects occur on gold. The squaraine-silver interaction is mediated by the carbonyl and hydroxyl oxygens located in the center of the molecule. The intermolecular coupling, on the other hand, is governed by hydrogen bonds formed between the terminal isobutyl groups and oxygen species of adjacent molecules. The latter gets maximized by rotating the molecules by a few degrees against a perfect square alignment. A similar molecular pattern does not form on Au(111) due to symmetry mismatch. Moreover, the high electronegativity of gold reduces the directing effect of oxygen-metal bonds that trigger the ordering process on silver. As a consequence, only frustrated three-fold symmetric units that do not expand into an ordered molecular network are present on the gold surface.
    Sprache Englisch
    Erscheinungsdatum 2018-02-21
    Erscheinungsland United States
    Dokumenttyp Journal Article
    ZDB-ID 3113-6
    ISSN 1089-7690 ; 0021-9606
    ISSN (online) 1089-7690
    ISSN 0021-9606
    DOI 10.1063/1.5017826
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

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  6. Artikel ; Online: Incorrect DFT-GGA predictions of the stability of non-stoichiometric/polar dielectric surfaces: the case of Cu2O(111).

    Nilius, Niklas / Fedderwitz, Hanna / Groß, Boris / Noguera, Claudine / Goniakowski, Jacek

    Physical chemistry chemical physics : PCCP

    2016  Band 18, Heft 9, Seite(n) 6729–6733

    Abstract: Scanning tunneling microscopy (STM) and hybrid density functional theory (DFT) have been used to study the stability and electronic characteristics of the Cu2O(111) surface. We challenge previous interpretations of its structure and composition and show ... ...

    Abstract Scanning tunneling microscopy (STM) and hybrid density functional theory (DFT) have been used to study the stability and electronic characteristics of the Cu2O(111) surface. We challenge previous interpretations of its structure and composition and show that only appropriate (hybrid) calculations can correctly account for the relative thermodynamic stability of stoichiometric versus Cu-deficient terminations. Our theoretical finding of the stoichiometric surface to be most stable at oxygen-lean conditions is confirmed by an excellent matching between STM spectroscopy data and the calculated surface electronic structure. Beyond the specific case of the Cu2O(111) surface, and beyond the known deficiencies of GGA-based approaches in the description of oxide electronic structures, our work highlights the risk of an erroneous evaluation of the surface stability, in cases where the energetics and electronic characteristics are strongly coupled, as in a wide class of polar and/or non-stoichiometric oxide surfaces.
    Sprache Englisch
    Erscheinungsdatum 2016-03-07
    Erscheinungsland England
    Dokumenttyp Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 1476244-4
    ISSN 1463-9084 ; 1463-9076
    ISSN (online) 1463-9084
    ISSN 1463-9076
    DOI 10.1039/c5cp06933e
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

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