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  1. Article

    Open Access

    Direct observation of a highly spin-polarized organic spinterface at room temperature

    Organic semiconductors constitute promising candidates toward large-scale electronic circuits that are entirely spintronics-driven. Toward this goal, tunneling magnetoresistance values above 300% at low temper...

    F. Djeghloul, F. Ibrahim, M. Cantoni, M. Bowen, L. Joly, S. Boukari… in Scientific Reports (2013)

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  2. No Access

    Article

    Magnetoelectric coupling at metal surfaces

    Magnetoelectric coupling allows the magnetic state of a material to be changed by an applied electric field. To date, this phenomenon has mainly been observed in insulating materials such as complex multiferro...

    L. Gerhard, T. K. Yamada, T. Balashov, A. F. Takács… in Nature Nanotechnology (2010)

  3. No Access

    Article

    Etching nano-holes in silicon carbide using catalytic platinum nano-particles

    The catalytic reaction of platinum during a hydrogen etching process has been used to perform controlled vertical nanopatterning of silicon carbide substrates. A first set of experiments was performed with pla...

    E. Moyen, W. Wulfhekel, W. Lee, A. Leycuras, K. Nielsch, U. Gösele… in Applied Physics A (2006)

  4. No Access

    Article

    Vertical nanopatterning of 6H-SiC(0001) surfaces using gold-metal nanotube membrane lithography

    Large-area membranes consisting of arrays of gold metal nanotubes were used as shadow masks to generate vertical nanopatterned 6H-SiC(0001) substrates. The gold membranes are formed by a replication technique ...

    W. Lee, E. Moyen, W. Wulfhekel, A. Leycuras, K. Nielsch, U. Gösele… in Applied Physics A (2006)

  5. No Access

    Chapter

    High Resolution Magnetic Imaging by Local Tunneling Magnetoresistance

    An introduction to spin-polarized scanning tunneling microscopy with a soft magnetic tip is given. After illustrating the fundamental physical effect of tunneling magnetoresistance and giving a short historica...

    W. Wulfhekel in Magnetic Microscopy of Nanostructures (2005)

  6. No Access

    Article

    Highly regular nanometer-sized hexagonal pipes in 6H-SiC(0001)

    An array of troughs was prepared on a 6H-SiC(0001) surface using focused ion beam (FIB) patterning. Troughs were etched with various ion doses and close-to-circular voids of increasing depths for larger ion do...

    W. Wulfhekel, D. Sander, S. Nitsche, A. Leycuras, M. Hanbücken in Applied Physics A (2004)

  7. No Access

    Article

    High-resolution magnetic imaging by local tunneling magnetoresistance

    We give an overview over our recent efforts of high-resolution magnetic imaging using scanning tunneling microscopy with a ferromagnetic tip. Magnetic sensitivity is obtained on the basis of local tunneling ma...

    W. Wulfhekel, H.F. Ding, W. Lutzke, G. Steierl, M. Vázquez, P. Marín… in Applied Physics A (2001)

  8. No Access

    Chapter

    The Role of Interfaces in Magnetic and Electron Transport Properties of Au/Fe/Cu/Fe/GaAs(001) and Fe/MgO/Fe-Whisker(001) Systems

    Smooth and As free Fe layers were grown directly on semi-insulating GaAs(001) templates with a pseudo 4 × 6 surface reconstruction. The STM studies revealed that the pseudo 4 × 6 reconstruction consists of 1 ×...

    T. L. Monchesky, A. Enders, R. Urban, J. F. Cochran… in Physics of Low Dimensional Systems (2001)

  9. No Access

    Article

    New concepts for controlled homoepitaxy

    On the basis of a kinetic growth model we discuss new methods to grow atomically flat homoepitaxial layers in a controlled way. The underlying principle of these methods is to change the growth parameters duri...

    G. Rosenfeld, N. N. Lipkin, W. Wulfhekel, J. Kliewer, K. Morgenstern… in Applied Physics A (1995)

  10. No Access

    Article

    Mössbauer line-sharpening: Application to magnetically-split spectra

    The contrast in a Mössbauer spectrum can be enhanced by a model-independent method of line sharpening, due to Afanas'ev and Tsymbal, which employs higher powers of Lorenztian lines. We have investigated the ap...

    W. Wulfhekel, J. M. Cadogan in Hyperfine Interactions (1994)